12+9y-7y=20

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Solution for 12+9y-7y=20 equation: 



12+9y-7y=20

We move all terms to the left:

12+9y-7y-(20)=0

We add all the numbers together, and all the variables

2y-8=0

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

2y=8

y=8/2

y=4

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