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250=(x+15)+(x-5)+x
We move all terms to the left:
250-((x+15)+(x-5)+x)=0
We calculate terms in parentheses: -((x+15)+(x-5)+x), so:We get rid of parentheses
(x+15)+(x-5)+x
We add all the numbers together, and all the variables
x+(x+15)+(x-5)
We get rid of parentheses
x+x+x+15-5
We add all the numbers together, and all the variables
3x+10
Back to the equation:
-(3x+10)
-3x-10+250=0
We add all the numbers together, and all the variables
-3x+240=0
We move all terms containing x to the left, all other terms to the right
-3x=-240
x=-240/-3
x=+80
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