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13x+12=5x+252
We move all terms to the left:
13x+12-(5x+252)=0
We get rid of parentheses
13x-5x-252+12=0
We add all the numbers together, and all the variables
8x-240=0
We move all terms containing x to the left, all other terms to the right
8x=240
x=240/8
x=30
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