y=9-12

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Solution for y=9-12 equation: 



y=9-12

We move all terms to the left:

y-(9-12)=0

We add all the numbers together, and all the variables

y-(-3)=0

We add all the numbers together, and all the variables

y+3=0

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

y=-3

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