X+(x+15)=40

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Solution for X+(x+15)=40 equation: 



X+(X+15)=40

We move all terms to the left:

X+(X+15)-(40)=0

We get rid of parentheses

X+X+15-40=0

We add all the numbers together, and all the variables

2X-25=0

We move all terms containing X to the left, all other terms to the right

2X=25

X=25/2

X=12+1/2

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