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13=-7+2x
We move all terms to the left:
13-(-7+2x)=0
We add all the numbers together, and all the variables
-(2x-7)+13=0
We get rid of parentheses
-2x+7+13=0
We add all the numbers together, and all the variables
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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