-9a+9=90

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Solution for -9a+9=90 equation: 



-9a+9=90

We move all terms to the left:

-9a+9-(90)=0

We add all the numbers together, and all the variables

-9a-81=0

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

-9a=81

a=81/-9

a=-9

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