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2a-6(a-6)=-4
We move all terms to the left:
2a-6(a-6)-(-4)=0
We add all the numbers together, and all the variables
2a-6(a-6)+4=0
We multiply parentheses
2a-6a+36+4=0
We add all the numbers together, and all the variables
-4a+40=0
We move all terms containing a to the left, all other terms to the right
-4a=-40
a=-40/-4
a=+10
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