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90=(x+22)+(3x)
We move all terms to the left:
90-((x+22)+(3x))=0
We calculate terms in parentheses: -((x+22)+3x), so:We get rid of parentheses
(x+22)+3x
We add all the numbers together, and all the variables
3x+(x+22)
We get rid of parentheses
3x+x+22
We add all the numbers together, and all the variables
4x+22
Back to the equation:
-(4x+22)
-4x-22+90=0
We add all the numbers together, and all the variables
-4x+68=0
We move all terms containing x to the left, all other terms to the right
-4x=-68
x=-68/-4
x=+17
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