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(4x+10)=(x+20)=90
We move all terms to the left:
(4x+10)-((x+20))=0
We get rid of parentheses
4x-((x+20))+10=0
We calculate terms in parentheses: -((x+20)), so:We get rid of parentheses
(x+20)
We get rid of parentheses
x+20
Back to the equation:
-(x+20)
4x-x-20+10=0
We add all the numbers together, and all the variables
3x-10=0
We move all terms containing x to the left, all other terms to the right
3x=10
x=10/3
x=3+1/3
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