x+3x+15=99

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Solution for x+3x+15=99 equation: 



x+3x+15=99

We move all terms to the left:

x+3x+15-(99)=0

We add all the numbers together, and all the variables

4x-84=0

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

4x=84

x=84/4

x=21

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