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15x-5=12x+x+13
We move all terms to the left:
15x-5-(12x+x+13)=0
We add all the numbers together, and all the variables
15x-(13x+13)-5=0
We get rid of parentheses
15x-13x-13-5=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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