Dau coronita îmi trebuie urgent! ! ! ! ! ! ! ! ! ! !

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