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90=(3x+2)+(2x+18)
We move all terms to the left:
90-((3x+2)+(2x+18))=0
We calculate terms in parentheses: -((3x+2)+(2x+18)), so:We get rid of parentheses
(3x+2)+(2x+18)
We get rid of parentheses
3x+2x+2+18
We add all the numbers together, and all the variables
5x+20
Back to the equation:
-(5x+20)
-5x-20+90=0
We add all the numbers together, and all the variables
-5x+70=0
We move all terms containing x to the left, all other terms to the right
-5x=-70
x=-70/-5
x=+14
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