Solve for a
a<-90
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20a+900-12a<180
Use the distributive property to multiply 75-a by 12.
8a+900<180
Combine 20a and -12a to get 8a.
8a<180-900
Subtract 900 from both sides.
8a<-720
Subtract 900 from 180 to get -720.
a<\frac{-720}{8}
Divide both sides by 8. Since 8 is positive, the inequality direction remains the same.
a<-90
Divide -720 by 8 to get -90.
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