4a+21=10a-9

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Solution for 4a+21=10a-9 equation: 



4a+21=10a-9

We move all terms to the left:

4a+21-(10a-9)=0

We get rid of parentheses

4a-10a+9+21=0

We add all the numbers together, and all the variables

-6a+30=0

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

-6a=-30

a=-30/-6

a=+5

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