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x+30=(2x-12)
We move all terms to the left:
x+30-((2x-12))=0
We calculate terms in parentheses: -((2x-12)), so:We get rid of parentheses
(2x-12)
We get rid of parentheses
2x-12
Back to the equation:
-(2x-12)
x-2x+12+30=0
We add all the numbers together, and all the variables
-1x+42=0
We move all terms containing x to the left, all other terms to the right
-x=-42
x=-42/-1
x=+42
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