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90=(2x-17)+(x-4)
We move all terms to the left:
90-((2x-17)+(x-4))=0
We calculate terms in parentheses: -((2x-17)+(x-4)), so:We get rid of parentheses
(2x-17)+(x-4)
We get rid of parentheses
2x+x-17-4
We add all the numbers together, and all the variables
3x-21
Back to the equation:
-(3x-21)
-3x+21+90=0
We add all the numbers together, and all the variables
-3x+111=0
We move all terms containing x to the left, all other terms to the right
-3x=-111
x=-111/-3
x=+37
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