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5(3-y)=20

We move all terms to the left:

5(3-y)-(20)=0

We add all the numbers together, and all the variables

5(-1y+3)-20=0

We multiply parentheses

-5y+15-20=0

We add all the numbers together, and all the variables

-5y-5=0

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

-5y=5

y=5/-5

y=-1

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