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x2-6x-2x+7+9=0
x2-8x+16=0
(x-4) atau (x-4)
x=4
y=2x-9
y=2.4-9
y=8-9
y=-1
(B)
x2-6-2x+7+9=0
x2-8x+16=0
x=4
y=2x-9
xy=2.4.9=-1