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Alexiucaale
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6+[15-(8:ax7+7)]x5=8:(1x4)+3x3
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Răspuns :

6+[15-(8:ax7+7)]x5=8:(1x4)+3x3
6 + [ 15 - ( 8 : a × 7 + 7)] ×5 = 8 :4 + 9
6 + [ 15 - ( 8: a × 7 + 7)] × 5 = 11
[ 15 - ( 8 : a × 7 + 7)] ×5 = 11 - 6
15 - ( 8 : a × 7 + 7) = 5 :5
8 : a × 7 + 7 = 15 - 1
8 : a × 7 + 7 = 14
8 : a × 7 = 14 -7
8 : a = 7 :7
8 : a = 1
a = 8