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-6x-6(-4x+2)=78
We move all terms to the left:
-6x-6(-4x+2)-(78)=0
We multiply parentheses
-6x+24x-12-78=0
We add all the numbers together, and all the variables
18x-90=0
We move all terms containing x to the left, all other terms to the right
18x=90
x=90/18
x=5
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