4X+15=8x+21.X

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Solution for 4X+15=8x+21.X equation: 



4X+15=8X+21.X

We move all terms to the left:

4X+15-(8X+21.X)=0

We add all the numbers together, and all the variables

4X-(+29X)+15=0

We get rid of parentheses

4X-29X+15=0

We add all the numbers together, and all the variables

-25X+15=0

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

-25X=-15

X=-15/-25

X=3/5

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