3x+15+x+15=90

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



3x+15+x+15=90

We move all terms to the left:

3x+15+x+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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