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3p + 2q = -2
10p - 2q = 28
3p + 2q = -2
13p = 26
p = 2
3(2) + 2q = -2
6 + 2q = -2
2q = -2 - 6
q = -4
p + 3q = 2 + 3(-4) = 2 + -12 = -10