X+3+2X=-x+15

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Solution for X+3+2X=-x+15 equation: 



X+3+2X=-X+15

We move all terms to the left:

X+3+2X-(-X+15)=0

We add all the numbers together, and all the variables

X+2X-(-1X+15)+3=0

We add all the numbers together, and all the variables

3X-(-1X+15)+3=0

We get rid of parentheses

3X+1X-15+3=0

We add all the numbers together, and all the variables

4X-12=0

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

4X=12

X=12/4

X=3

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