7y-8y-9=10

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Solution for 7y-8y-9=10 equation: 



7y-8y-9=10

We move all terms to the left:

7y-8y-9-(10)=0

We add all the numbers together, and all the variables

-1y-19=0

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

-y=19

y=19/-1

y=-19

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