-5a+3+6a=9-21

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Solution for -5a+3+6a=9-21 equation: 



-5a+3+6a=9-21

We move all terms to the left:

-5a+3+6a-(9-21)=0

We add all the numbers together, and all the variables

-5a+6a+3-(-12)=0

We add all the numbers together, and all the variables

a+15=0

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

a=-15

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