90-4y=X

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Solution for 90-4y=X equation: 



90-4y=y

We move all terms to the left:

90-4y-(y)=0

We add all the numbers together, and all the variables

-5y+90=0

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

-5y=-90

y=-90/-5

y=+18

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