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2Q + P = 21
4k + 3k = 21
7k = 21
k = 3
Maka,
P = 3k = 3 × 3 = 9
Q = 2k = 2 × 3 = 6
Maka:
3P - 4Q
= 3 × (9) - 4 × (6)
= 27 - 24
= 3
Jadi, nilai dari 3P - 4Q adalah 3