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3p-2q= 14
12p+9q= -12
12p-8q= 56
17q= -68
q= -68/17= -4
3p-2q= 14
3p-2(-4)= 14
3p+8=14
3p=14-8
3p= 6
p= 2
maka p-3q= 2-3(-4)= 2+12=14