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5x-7+2x=12-3x+1
We move all terms to the left:
5x-7+2x-(12-3x+1)=0
We add all the numbers together, and all the variables
5x+2x-(-3x+13)-7=0
We add all the numbers together, and all the variables
7x-(-3x+13)-7=0
We get rid of parentheses
7x+3x-13-7=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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