X+x+x+15=90

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Solution for X+x+x+15=90 equation: 



X+X+X+15=90

We move all terms to the left:

X+X+X+15-(90)=0

We add all the numbers together, and all the variables

3X-75=0

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

3X=75

X=75/3

X=25

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