4x-21=7x+15

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Solution for 4x-21=7x+15 equation: 



4x-21=7x+15

We move all terms to the left:

4x-21-(7x+15)=0

We get rid of parentheses

4x-7x-15-21=0

We add all the numbers together, and all the variables

-3x-36=0

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

-3x=36

x=36/-3

x=-12

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