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