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(4x+3)+12x=131
We move all terms to the left:
(4x+3)+12x-(131)=0
We add all the numbers together, and all the variables
12x+(4x+3)-131=0
We get rid of parentheses
12x+4x+3-131=0
We add all the numbers together, and all the variables
16x-128=0
We move all terms containing x to the left, all other terms to the right
16x=128
x=128/16
x=8
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