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4x + 3y = -7 ⇒ x1 ⇒ 4x + 3y = -7 +
6x = 12
x = 2
4x + 3y = -7
4(2) + 3y = -7
8 + 3y = -7
3y = -7 - 8
3y = -15
y = -5
(p,q) = (x,y)
(2, -5)
jadi, 3p + q = 3(2) - 5
= 6 - 5
= 1