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13-4x-1=-7x
We move all terms to the left:
13-4x-1-(-7x)=0
We add all the numbers together, and all the variables
-4x-(-7x)+12=0
We get rid of parentheses
-4x+7x+12=0
We add all the numbers together, and all the variables
3x+12=0
We move all terms containing x to the left, all other terms to the right
3x=-12
x=-12/3
x=-4
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