what is 7-y-y=-1

what is 7-y-y=-1

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It's an equation; would you like to know what exact number y is?

-y-y=-1-7
-y^2=-8
-(y^2=8)
\[\sqrt{y}=\sqrt{8}\]
y= \[2\sqrt{2}\]

was this
\[7-y-y = -1\]or\[7*(-y)*(-y)=-1\]\[7-y*(-y) = -1\]
? I have to know before I go on!

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