180=(X+20)+(2X+10)+(x-10)

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Solution for 180=(X+20)+(2X+10)+(x-10) equation:



180=(X+20)+(2X+10)+(X-10)
We move all terms to the left:
180-((X+20)+(2X+10)+(X-10))=0
We calculate terms in parentheses: -((X+20)+(2X+10)+(X-10)), so:
(X+20)+(2X+10)+(X-10)
We get rid of parentheses
X+2X+X+20+10-10
We add all the numbers together, and all the variables
4X+20
Back to the equation:
-(4X+20)
We get rid of parentheses
-4X-20+180=0
We add all the numbers together, and all the variables
-4X+160=0
We move all terms containing X to the left, all other terms to the right
-4X=-160
X=-160/-4
X=+40

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