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8(5a-6)-a=-126
We move all terms to the left:
8(5a-6)-a-(-126)=0
We add all the numbers together, and all the variables
-1a+8(5a-6)+126=0
We multiply parentheses
-1a+40a-48+126=0
We add all the numbers together, and all the variables
39a+78=0
We move all terms containing a to the left, all other terms to the right
39a=-78
a=-78/39
a=-2
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