2+1-7=y

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Solution for 2+1-7=y equation: 



2+1-7=y

We move all terms to the left:

2+1-7-(y)=0

We add all the numbers together, and all the variables

-1y-4=0

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

-y=4

y=4/-1

y=-4

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