2x+21=3x-9

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Solution for 2x+21=3x-9 equation: 



2x+21=3x-9

We move all terms to the left:

2x+21-(3x-9)=0

We get rid of parentheses

2x-3x+9+21=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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