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x+13=-20(6-x)
We move all terms to the left:
x+13-(-20(6-x))=0
We add all the numbers together, and all the variables
x-(-20(-1x+6))+13=0
We calculate terms in parentheses: -(-20(-1x+6)), so:We get rid of parentheses
-20(-1x+6)
We multiply parentheses
20x-120
Back to the equation:
-(20x-120)
x-20x+120+13=0
We add all the numbers together, and all the variables
-19x+133=0
We move all terms containing x to the left, all other terms to the right
-19x=-133
x=-133/-19
x=+7
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