X+15+3x+15=90

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Solution for X+15+3x+15=90 equation: 



X+15+3X+15=90

We move all terms to the left:

X+15+3X+15-(90)=0

We add all the numbers together, and all the variables

4X-60=0

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

4X=60

X=60/4

X=15

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