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q+r = -1 pers(2)
p+r = 6 pers(3) substitusikan nilai p--> (1-q)+r=6 --> -q+r=6-1 --> -q+r=5
ELIMINASI
q + r = -1
-q + r = 5 -
2q=-6 -->q=-6/2 ---> q=-3
substitusikan nilai q ke pers(2)
q+r=-1--> -3+r=-1 --> r=-1+3 --> r=2
substitusikan nilai q ke pers(1)
p+q=1 --> p-3=1 -->p=1+3 ---> p=4
p+q+r=4-3+2=3