12 - 5z/4 -100 Divide each side by 5. z > -20

12 - 5z/4 < 37

12-5z/4 < 37
Subtract 12 from each side.
-5z/4 < 25
Mulitply each side by -4 to cancel out the negative and 4 in the denominator. Switch the inequality symbol because you are multiplying/dividing by a negative number.
5z > -100
Divide each side by 5.
z > -20

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