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90=(2x+20)+(3x)
We move all terms to the left:
90-((2x+20)+(3x))=0
We calculate terms in parentheses: -((2x+20)+3x), so:We get rid of parentheses
(2x+20)+3x
We add all the numbers together, and all the variables
3x+(2x+20)
We get rid of parentheses
3x+2x+20
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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