-10a+9a=-3

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Solution for -10a+9a=-3 equation: 



-10a+9a=-3

We move all terms to the left:

-10a+9a-(-3)=0

We add all the numbers together, and all the variables

-1a+3=0

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

-a=-3

a=-3/-1

a=+3

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