10a+9-4a=-21

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



10a+9-4a=-21

We move all terms to the left:

10a+9-4a-(-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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