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Răspuns :

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

Verificare
1+{2x[3+(4-4)x5]:6}x7=8
1+[2x(3+0x5):6]x7=8
1+[2x(3+0):6]x7=8
1+(2x3:6)x7=8
1+(6:6)x7=9
1+1x7=8
1+7=8
8=8 adevărat

Deci a=4