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90=(4x-10)+(x)
We move all terms to the left:
90-((4x-10)+(x))=0
We calculate terms in parentheses: -((4x-10)+x), so:We get rid of parentheses
(4x-10)+x
We add all the numbers together, and all the variables
x+(4x-10)
We get rid of parentheses
x+4x-10
We add all the numbers together, and all the variables
5x-10
Back to the equation:
-(5x-10)
-5x+10+90=0
We add all the numbers together, and all the variables
-5x+100=0
We move all terms containing x to the left, all other terms to the right
-5x=-100
x=-100/-5
x=+20
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