90-q=2q

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Solution for 90-q=2q equation: 



90-q=2q

We move all terms to the left:

90-q-(2q)=0

We add all the numbers together, and all the variables

-3q+90=0

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

-3q=-90

q=-90/-3

q=+30

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