12.9=y-4.2

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Solution for 12.9=y-4.2 equation: 



12.9=y-4.2

We move all terms to the left:

12.9-(y-4.2)=0

We get rid of parentheses

-y+4.2+12.9=0

We add all the numbers together, and all the variables

-1y+17.1=0

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

-y=-17.1

y=-17.1/-1

y=17+0.1/1

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