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13-6x+x=-8x-15-4x
We move all terms to the left:
13-6x+x-(-8x-15-4x)=0
We add all the numbers together, and all the variables
-6x+x-(-12x-15)+13=0
We add all the numbers together, and all the variables
-5x-(-12x-15)+13=0
We get rid of parentheses
-5x+12x+15+13=0
We add all the numbers together, and all the variables
7x+28=0
We move all terms containing x to the left, all other terms to the right
7x=-28
x=-28/7
x=-4
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