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2x{8+7x[6+5x(4+3x2x1)]}:[(9+8+7+6+5+4+3+2+1)-5x8]=

Răspuns :

2x{8+7x[6+5x(4+6)]}:(45-5x8)=
2x[8+7x(6+5x10)]:(45-40)=
2x[8+7x(6+50)]:5=
2x(8+7x56):5=
2x(8+392):5=
2x400:5=
800:5=160