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3x+2x=3x+12
We move all terms to the left:
3x+2x-(3x+12)=0
We add all the numbers together, and all the variables
5x-(3x+12)=0
We get rid of parentheses
5x-3x-12=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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