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-13x+9=15-7x
We move all terms to the left:
-13x+9-(15-7x)=0
We add all the numbers together, and all the variables
-13x-(-7x+15)+9=0
We get rid of parentheses
-13x+7x-15+9=0
We add all the numbers together, and all the variables
-6x-6=0
We move all terms containing x to the left, all other terms to the right
-6x=6
x=6/-6
x=-1
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