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48+30=(x+x)
We move all terms to the left:
48+30-((x+x))=0
We add all the numbers together, and all the variables
-((+2x))+48+30=0
We add all the numbers together, and all the variables
-((+2x))+78=0
We calculate terms in parentheses: -((+2x)), so:We move all terms containing x to the left, all other terms to the right
(+2x)
We get rid of parentheses
2x
Back to the equation:
-(2x)
-2x=-78
x=-78/-2
x=+39
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