x+3x+15=135

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Solution for x+3x+15=135 equation: 



x+3x+15=135

We move all terms to the left:

x+3x+15-(135)=0

We add all the numbers together, and all the variables

4x-120=0

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

4x=120

x=120/4

x=30

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