Solve for y
y<-9980
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-380-y>9600
Subtract 400 from 20 to get -380.
-y>9600+380
Add 380 to both sides.
-y>9980
Add 9600 and 380 to get 9980.
y<-9980
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
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Matrix
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