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-7x+3(-2x-4)=131
We move all terms to the left:
-7x+3(-2x-4)-(131)=0
We multiply parentheses
-7x-6x-12-131=0
We add all the numbers together, and all the variables
-13x-143=0
We move all terms containing x to the left, all other terms to the right
-13x=143
x=143/-13
x=-11
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