X+15+x+2x=100

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Solution for X+15+x+2x=100 equation: 



X+15+X+2X=100

We move all terms to the left:

X+15+X+2X-(100)=0

We add all the numbers together, and all the variables

4X-85=0

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

4X=85

X=85/4

X=21+1/4

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