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12x+2x=57-1
We move all terms to the left:
12x+2x-(57-1)=0
We add all the numbers together, and all the variables
12x+2x-56=0
We add all the numbers together, and all the variables
14x-56=0
We move all terms containing x to the left, all other terms to the right
14x=56
x=56/14
x=4
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