3a-9=90

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Solution for 3a-9=90 equation: 



3a-9=90

We move all terms to the left:

3a-9-(90)=0

We add all the numbers together, and all the variables

3a-99=0

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

3a=99

a=99/3

a=33

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