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6+[15-(8:a×7+7)]×5 =8

Răspuns :

6+[15-(8:a×7+7)]×5 =8:4+9
[15 - (8:a
×7+7)]×5=11 - 6
15 - (8:a×7+7)= 5:5
8 : a×7+7=15-1
8 :a ×7=14 -7
8:a =7:7
8:a=1
a = 8:1
a=8 

6+[15-(8:a*7+7)]*5=8:(1*4)+3*3
6+[15-(8:a*7+7)]*5=8:4+9
6+[15-(8:a*7+7)]*5=2+9
6+[15-(8:a*7+7)]*5=11
15-(8:a*7+7)*5=11-6
15-(8:a*7+7)*5=5
15-(8:a*7+7)=5:5
15-(8:a*7+7)=1
8:a*7+7=15-1
8:a*7+7=14
8:a*7=14-7
8:a*7=7
8:a=7:7
8:a=1
a=8:1
a=8