Solve for p
p<-10
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-21-p>-11
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
-p>-11+21
Add 21 to both sides.
-p>10
Add -11 and 21 to get 10.
p<-10
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
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