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12x-14=-3x+31
We move all terms to the left:
12x-14-(-3x+31)=0
We get rid of parentheses
12x+3x-31-14=0
We add all the numbers together, and all the variables
15x-45=0
We move all terms containing x to the left, all other terms to the right
15x=45
x=45/15
x=3
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