7y-9y=20

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Solution for 7y-9y=20 equation: 



7y-9y=20

We move all terms to the left:

7y-9y-(20)=0

We add all the numbers together, and all the variables

-2y-20=0

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

-2y=20

y=20/-2

y=-10

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