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12x+3=13x+2
We move all terms to the left:
12x+3-(13x+2)=0
We get rid of parentheses
12x-13x-2+3=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1
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