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65=(15+x)+x
We move all terms to the left:
65-((15+x)+x)=0
We add all the numbers together, and all the variables
-((x+15)+x)+65=0
We calculate terms in parentheses: -((x+15)+x), so:We get rid of parentheses
(x+15)+x
We add all the numbers together, and all the variables
x+(x+15)
We get rid of parentheses
x+x+15
We add all the numbers together, and all the variables
2x+15
Back to the equation:
-(2x+15)
-2x-15+65=0
We add all the numbers together, and all the variables
-2x+50=0
We move all terms containing x to the left, all other terms to the right
-2x=-50
x=-50/-2
x=+25
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