X+x+15=45

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Solution for X+x+15=45 equation: 



X+X+15=45

We move all terms to the left:

X+X+15-(45)=0

We add all the numbers together, and all the variables

2X-30=0

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

2X=30

X=30/2

X=15

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