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2x+3+3x=x+12
We move all terms to the left:
2x+3+3x-(x+12)=0
We add all the numbers together, and all the variables
5x-(x+12)+3=0
We get rid of parentheses
5x-x-12+3=0
We add all the numbers together, and all the variables
4x-9=0
We move all terms containing x to the left, all other terms to the right
4x=9
x=9/4
x=2+1/4
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