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 get rid of parentheses

4x-7x-9+21=0

We add all the numbers together, and all the variables

-3x+12=0

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

-3x=-12

x=-12/-3

x=+4

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