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3px - p + 2qx - 3q = 18x + 1
(3p + 2q)x -p - 3q = 18x + 1
3p + 2q = 18 (x1) 3p + 2q = 18
-p - 3q = 1 (x3) -3p - 9q = 3+
-7q = 21
q = -3
3p + 2q = 18
3p + 2(-3) = 18
3p - 6 = 18
3p = 24
p = 8
jawaban -3 dan 8 (B)