It is an algebraic expression with its plus or minus signs missing
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-9y + 8 = -91-9y = -91 -8-9y = -99y = -99-----9y = 11-99/-9 = 11 because -9X11 = -99
To answer the question you need to know what Y=.
y = 16/33
The interval is, presumably, the range = 12.
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