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x-4=0 x+1=0
x=4 x=-1
x1>x2 jd x1=4 x2=-1
2x1+5x2=2.4+5.-1=8-5=3
(x-1) dan (x+4)
= 2 X₁ + 5 X₂
= 2 (4) + 5 (-1)
= 8 - 5
= 3