X+3z=15

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Solution for X+3z=15 equation: 



X+3X=15

We move all terms to the left:

X+3X-(15)=0

We add all the numbers together, and all the variables

4X-15=0

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

4X=15

X=15/4

X=3+3/4

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