90-3a=a

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Solution for 90-3a=a equation: 



90-3a=a

We move all terms to the left:

90-3a-(a)=0

We add all the numbers together, and all the variables

-4a+90=0

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

-4a=-90

a=-90/-4

a=22+1/2

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