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7(3x-9)-13=2(5x+7)
We move all terms to the left:
7(3x-9)-13-(2(5x+7))=0
We multiply parentheses
21x-(2(5x+7))-63-13=0
We calculate terms in parentheses: -(2(5x+7)), so:We add all the numbers together, and all the variables
2(5x+7)
We multiply parentheses
10x+14
Back to the equation:
-(10x+14)
21x-(10x+14)-76=0
We get rid of parentheses
21x-10x-14-76=0
We add all the numbers together, and all the variables
11x-90=0
We move all terms containing x to the left, all other terms to the right
11x=90
x=90/11
x=8+2/11
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