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20x²-5x-8x+2=0
5x(4x-1)-2(4x-1)
(5x-2)(4x-1)
x=2/5 atau x=1/4
20x²-5x-8x+2=0
5x(4x-1)-2(4x-1)
(5x-2)(4x-1)
x=2/5 atau x=1/4