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100=(x+12)+x
We move all terms to the left:
100-((x+12)+x)=0
We calculate terms in parentheses: -((x+12)+x), so:We get rid of parentheses
(x+12)+x
We add all the numbers together, and all the variables
x+(x+12)
We get rid of parentheses
x+x+12
We add all the numbers together, and all the variables
2x+12
Back to the equation:
-(2x+12)
-2x-12+100=0
We add all the numbers together, and all the variables
-2x+88=0
We move all terms containing x to the left, all other terms to the right
-2x=-88
x=-88/-2
x=+44
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