30-4y=90

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Solution for 30-4y=90 equation: 



30-4y=90

We move all terms to the left:

30-4y-(90)=0

We add all the numbers together, and all the variables

-4y-60=0

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

-4y=60

y=60/-4

y=-15

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