4x+21=15x-4x

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Solution for 4x+21=15x-4x equation: 



4x+21=15x-4x

We move all terms to the left:

4x+21-(15x-4x)=0

We add all the numbers together, and all the variables

4x-(+11x)+21=0

We get rid of parentheses

4x-11x+21=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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