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12x-13=3x-33
We move all terms to the left:
12x-13-(3x-33)=0
We get rid of parentheses
12x-3x+33-13=0
We add all the numbers together, and all the variables
9x+20=0
We move all terms containing x to the left, all other terms to the right
9x=-20
x=-20/9
x=-2+2/9
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