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13x-19=4x+12
We move all terms to the left:
13x-19-(4x+12)=0
We get rid of parentheses
13x-4x-12-19=0
We add all the numbers together, and all the variables
9x-31=0
We move all terms containing x to the left, all other terms to the right
9x=31
x=31/9
x=3+4/9
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