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2(2x+21)=(1x+18)
We move all terms to the left:
2(2x+21)-((1x+18))=0
We add all the numbers together, and all the variables
2(2x+21)-((x+18))=0
We multiply parentheses
4x-((x+18))+42=0
We calculate terms in parentheses: -((x+18)), so:We get rid of parentheses
(x+18)
We get rid of parentheses
x+18
Back to the equation:
-(x+18)
4x-x-18+42=0
We add all the numbers together, and all the variables
3x+24=0
We move all terms containing x to the left, all other terms to the right
3x=-24
x=-24/3
x=-8
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