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