7y-2y+y+3y=-20

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Solution for 7y-2y+y+3y=-20 equation: 



7y-2y+y+3y=-20

We move all terms to the left:

7y-2y+y+3y-(-20)=0

We add all the numbers together, and all the variables

9y+20=0

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

9y=-20

y=-20/9

y=-2+2/9

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