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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