4x+-21=7x-9

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Solution for 4x+-21=7x-9 equation: 



4x+-21=7x-9

We move all terms to the left:

4x+-21-(7x-9)=0

We add all the numbers together, and all the variables

4x-(7x-9)=0

We get rid of parentheses

4x-7x+9=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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