3x-9=4x+21

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Solution for 3x-9=4x+21 equation: 



3x-9=4x+21

We move all terms to the left:

3x-9-(4x+21)=0

We get rid of parentheses

3x-4x-21-9=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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