y=-2*9+-1y-3

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Solution for y=-2*9+-1y-3 equation: 



y=-2*9+-1y-3

We move all terms to the left:

y-(-2*9+-1y-3)=0

We add all the numbers together, and all the variables

y-(-1y-21)=0

We get rid of parentheses

y+1y+21=0

We add all the numbers together, and all the variables

2y+21=0

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

2y=-21

y=-21/2

y=-10+1/2

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