6y+9y=-15

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Solution for 6y+9y=-15 equation: 



6y+9y=-15

We move all terms to the left:

6y+9y-(-15)=0

We add all the numbers together, and all the variables

15y+15=0

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

15y=-15

y=-15/15

y=-1

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