5x+21=8x-9

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Solution for 5x+21=8x-9 equation: 



5x+21=8x-9

We move all terms to the left:

5x+21-(8x-9)=0

We get rid of parentheses

5x-8x+9+21=0

We add all the numbers together, and all the variables

-3x+30=0

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

-3x=-30

x=-30/-3

x=+10

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