X+3x=399

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Solution for X+3x=399 equation: 



X+3X=399

We move all terms to the left:

X+3X-(399)=0

We add all the numbers together, and all the variables

4X-399=0

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

4X=399

X=399/4

X=99+3/4

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