4X=15+y

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Solution for 4X=15+y equation: 



4X=15+X

We move all terms to the left:

4X-(15+X)=0

We add all the numbers together, and all the variables

4X-(X+15)=0

We get rid of parentheses

4X-X-15=0

We add all the numbers together, and all the variables

3X-15=0

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

3X=15

X=15/3

X=5

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