8y+7-4y=-9

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Solution for 8y+7-4y=-9 equation: 



8y+7-4y=-9

We move all terms to the left:

8y+7-4y-(-9)=0

We add all the numbers together, and all the variables

4y+16=0

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

4y=-16

y=-16/4

y=-4

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