a-21=-5a+9

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Solution for a-21=-5a+9 equation: 



a-21=-5a+9

We move all terms to the left:

a-21-(-5a+9)=0

We get rid of parentheses

a+5a-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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