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2x-(7-3x)=12
We move all terms to the left:
2x-(7-3x)-(12)=0
We add all the numbers together, and all the variables
2x-(-3x+7)-12=0
We get rid of parentheses
2x+3x-7-12=0
We add all the numbers together, and all the variables
5x-19=0
We move all terms containing x to the left, all other terms to the right
5x=19
x=19/5
x=3+4/5
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