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13x-237=4x-12
We move all terms to the left:
13x-237-(4x-12)=0
We get rid of parentheses
13x-4x+12-237=0
We add all the numbers together, and all the variables
9x-225=0
We move all terms containing x to the left, all other terms to the right
9x=225
x=225/9
x=25
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