129=12-y

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Solution for 129=12-y equation: 



129=12-y

We move all terms to the left:

129-(12-y)=0

We add all the numbers together, and all the variables

-(-1y+12)+129=0

We get rid of parentheses

1y-12+129=0

We add all the numbers together, and all the variables

y+117=0

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

y=-117

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