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-6(3a+6)=-126
We move all terms to the left:
-6(3a+6)-(-126)=0
We add all the numbers together, and all the variables
-6(3a+6)+126=0
We multiply parentheses
-18a-36+126=0
We add all the numbers together, and all the variables
-18a+90=0
We move all terms containing a to the left, all other terms to the right
-18a=-90
a=-90/-18
a=+5
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