Apresente uma derivação à extrema esquerda (DEE) da sentença x = a - (b * c - d) * (d - c / b) - a sobre a gramática a seguir.

G = ({A, B, C, D, E, F, G}, {a, b, c, d, x, =, +, -, *, /, (, )}, P, A)
P = {< A >  ->  < G > = < B >
     < B >  ->  < D > < C >  |  < D >
     < C >  ->  + < D > < C >  |  - < D > < C >  |  + < D >  |  - < D >
     < D >  ->  < F > < E >  |  < F >
     < E >  ->  * < F > < E >  |  / < F > < E >  |  * < F >  |  / < F >
     < F >  ->  ( < B > )  |  < G >
     < G >  ->  a  |  b  |  c  |  d  |  x }

< A >
< G > = < B >
x = < B >
x = < D > < C >
x = < F > < C >
x = < G > < C >
x = a < C >
x = a - < D > < C >
x = a - < F > < E > < C >
x = a - ( < B > ) < E > < C >
x = a - ( < D > < C > ) < E > < C >
x = a - ( < F > < E > < C > ) < E > < C >
x = a - ( < G > < E > < C > ) < E > < C >
x = a - ( b < E > < C > ) < E > < C >
x = a - ( b * < F > < C > ) < E > < C >
x = a - ( b * < G > < C > ) < E > < C >
x = a - ( b * c < C > ) < E > < C >
x = a - ( b * c - < D > ) < E > < C >
x = a - ( b * c - < F > ) < E > < C >
x = a - ( b * c - < G > ) < E > < C >
x = a - ( b * c - d ) < E > < C >
x = a - ( b * c - d ) * < F > < C >
x = a - ( b * c - d ) * ( < B > ) < C >
x = a - ( b * c - d ) * ( < D > < C > ) < C >
x = a - ( b * c - d ) * ( < F > < C > ) < C >
x = a - ( b * c - d ) * ( < G > < C > ) < C >
x = a - ( b * c - d ) * ( d < C > ) < C >
x = a - ( b * c - d ) * ( d - < D > ) < C >
x = a - ( b * c - d ) * ( d - < F > < E > ) < C >
x = a - ( b * c - d ) * ( d - < G > < E > ) < C >
x = a - ( b * c - d ) * ( d - c < E > ) < C >
x = a - ( b * c - d ) * ( d - c / < F > ) < C >
x = a - ( b * c - d ) * ( d - c / < G > ) < C >
x = a - ( b * c - d ) * ( d - c / b ) < C >
x = a - ( b * c - d ) * ( d - c / b ) - < D >
x = a - ( b * c - d ) * ( d - c / b ) - < F >
x = a - ( b * c - d ) * ( d - c / b ) - < G >
x = a - ( b * c - d ) * ( d - c / b ) - a