3x-9=5x+21

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Solution for 3x-9=5x+21 equation: 



3x-9=5x+21

We move all terms to the left:

3x-9-(5x+21)=0

We get rid of parentheses

3x-5x-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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