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5(x+21)=3x-13
We move all terms to the left:
5(x+21)-(3x-13)=0
We multiply parentheses
5x-(3x-13)+105=0
We get rid of parentheses
5x-3x+13+105=0
We add all the numbers together, and all the variables
2x+118=0
We move all terms containing x to the left, all other terms to the right
2x=-118
x=-118/2
x=-59
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