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1+{2×[3+(x-4)×5]:6}×7=8

Răspuns :

1+{2×[3+(x-4)×5]:6}×7=8
{2×[3+(x-4)×5]:6}×7=8 -1
{2×[3+(x-4)×5]:6}×7=7
2×[3+(x-4)×5]:6=1
3+(x-4)×5=3
(x-4)×5=3-3
(x-4)×5=0
x-4=0
x=4