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1+{2*[3+(a-4)*5]:6}*7=8

Răspuns :

{2[3+(a-4)*5]:6}*7=8-1
2[3+(a-4)]:6=7:7
2[3+(a-4)]=1x6
3+(a-4)=6:2
a-4=3-3
a=4
1+{2x[3+(a-4)x5]:6}x7=8{2x[3+(a-4)x5]:6}x7=8-1
{2x[3+(a-4)x5]:6}x7=7
2x[3+(a-4)x5]:6=7:7
2x[3+(a-4)x5]:6=1
2x[3+(a-4)x5]=1x6
2x[3+(a-4)x5]=6
3+(a-4)x5=6:2
3+(a-4)x5=3
(a-4)x5=3-3
(a-4)x5=0
a-4=0:5
a=4