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6x+7x=8x-15
We move all terms to the left:
6x+7x-(8x-15)=0
We add all the numbers together, and all the variables
13x-(8x-15)=0
We get rid of parentheses
13x-8x+15=0
We add all the numbers together, and all the variables
5x+15=0
We move all terms containing x to the left, all other terms to the right
5x=-15
x=-15/5
x=-3
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