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{[(2×a-4)×8+6]÷2 }+100=535

Răspuns :

{[(2×a-4)×8+6)÷2}+100=535
[(2×a-4)×8+6]÷2=535-100
[(2×a-4)×8+6]÷2=435
(2×a-4)×8+6=435×2
(2×a-4)×8+6=870
(2×a-4)×8=870-6
(2×a-4)×8=864
2×a-4=864÷8
2×a-4=108
2×a=108+4
2×a=112
a=112÷2
a=56
{[(2×a-4)×8+6]÷2 }+100=535

{[(2×a-4)×8+6]÷2 }=435

{[(2×a-4)×8+6]=870

(2×a-4)×8=864

(2×a-4)=108

    2×a = 112

        a = 56 .