90-a=4a

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Solution for 90-a=4a equation: 



90-a=4a

We move all terms to the left:

90-a-(4a)=0

We add all the numbers together, and all the variables

-5a+90=0

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

-5a=-90

a=-90/-5

a=+18

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