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13x-3x-12-5x=7x-5x+3
We move all terms to the left:
13x-3x-12-5x-(7x-5x+3)=0
We add all the numbers together, and all the variables
13x-3x-5x-(2x+3)-12=0
We add all the numbers together, and all the variables
5x-(2x+3)-12=0
We get rid of parentheses
5x-2x-3-12=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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