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3x+12-3=20+13
We move all terms to the left:
3x+12-3-(20+13)=0
We add all the numbers together, and all the variables
3x+12-3-33=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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