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-3x-13=-7x+19
We move all terms to the left:
-3x-13-(-7x+19)=0
We get rid of parentheses
-3x+7x-19-13=0
We add all the numbers together, and all the variables
4x-32=0
We move all terms containing x to the left, all other terms to the right
4x=32
x=32/4
x=8
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