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= (4a.2a)+(4a.1)+(-3.2a)+(-3.1)
= 8a^2 + 4a - 6a - 3
= 8a^2 - 2a - 3
jadi p= 8 q=-2 r=-3
p-q+r = 8 - (-2) + (-3)
= 8+2-3 = 7