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-13x=-15-7x
We move all terms to the left:
-13x-(-15-7x)=0
We add all the numbers together, and all the variables
-13x-(-7x-15)=0
We get rid of parentheses
-13x+7x+15=0
We add all the numbers together, and all the variables
-6x+15=0
We move all terms containing x to the left, all other terms to the right
-6x=-15
x=-15/-6
x=2+1/2
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