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13x-3=x+141
We move all terms to the left:
13x-3-(x+141)=0
We get rid of parentheses
13x-x-141-3=0
We add all the numbers together, and all the variables
12x-144=0
We move all terms containing x to the left, all other terms to the right
12x=144
x=144/12
x=12
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