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3p -2q = -18 | ×2
6p + 15q = 21
6p -4q = -36
___________-
19q = 57
q = 3
3p -2q = -18
3p - 2(3) = -18
3p - 6 = -18
3p = -12
p = -4
4p + 3q =
4 (-4) + 3(3) =
-16 + 9 = -5
jadi jumlah 4p + 3q = -5