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M= 14z -21

N= 24x -54

P= 40 +24y

Q= 60 -36z

E=x² +3x +4x +12 = x² +7x +12

F= 2y² +8y +6y + 24 = 2y² +14y +24

G= 15z -18z² +20 -24z = -18z² - 9z +20

H= -21t +35t²  +24 - 40t = 35t² -61t +24