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72=2(2x+x)
We move all terms to the left:
72-(2(2x+x))=0
We add all the numbers together, and all the variables
-(2(+3x))+72=0
We calculate terms in parentheses: -(2(+3x)), so:We move all terms containing x to the left, all other terms to the right
2(+3x)
We multiply parentheses
6x
Back to the equation:
-(6x)
-6x=-72
x=-72/-6
x=+12
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