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-y-9+2y-7=-1
To find the opposite of y+9, find the opposite of each term.
y-9-7=-1
Combine -y and 2y to get y.
y-16=-1
Subtract 7 from -9 to get -16.
y=-1+16
Add 16 to both sides.
y=15
Add -1 and 16 to get 15.