4(-2-1)-4y=20

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Solution for 4(-2-1)-4y=20 equation: 



4(-2-1)-4y=20

We move all terms to the left:

4(-2-1)-4y-(20)=0

determiningTheFunctionDomain
-4y-20+4(-2-1)=0

We add all the numbers together, and all the variables

-4y-20+4(-3)=0

We add all the numbers together, and all the variables

-4y-32=0

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

-4y=32

y=32/-4

y=-8

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