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q = 4p - 18
2p + 3q = 2
2p + 3(4p - 18) = 2
2p + 12p - 54 = 2
14p = 56
p = 4
q = 4p - 18 = 4 × 4 - 18 = 16 - 18 = -2
5p - 2q
= 5 × 4 - 2 × (-2)
= 20 + 4 = 24