4x+9=6x-21

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Solution for 4x+9=6x-21 equation: 



4x+9=6x-21

We move all terms to the left:

4x+9-(6x-21)=0

We get rid of parentheses

4x-6x+21+9=0

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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