-2(7-y)=20

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Solution for -2(7-y)=20 equation: 



-2(7-y)=20

We move all terms to the left:

-2(7-y)-(20)=0

We add all the numbers together, and all the variables

-2(-1y+7)-20=0

We multiply parentheses

2y-14-20=0

We add all the numbers together, and all the variables

2y-34=0

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

2y=34

y=34/2

y=17

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