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6(-2x+9)=126
We move all terms to the left:
6(-2x+9)-(126)=0
We multiply parentheses
-12x+54-126=0
We add all the numbers together, and all the variables
-12x-72=0
We move all terms containing x to the left, all other terms to the right
-12x=72
x=72/-12
x=-6
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