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2p-q = 18 (x4) --> 8p-4q = 72 +
11p = 66
p = 6
3.6+4q = -16
18+4q = -16
4q = -16-18
4q = -34
q = -34/4
q = -17/2
p+q = 6-17/2
= 12/2 - 17/2
= -5/2