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=(25.-5)+(3.9)+(-5x.-3.3)
=-125x-27-45x
=-170x-27
d=-2x(x+3) (3x-1)
=(2x'-6) (3x-1)
= -6x"-18x'+2x'+6
= -6x"-16x'+6
note : "pankat 3
' pankat 2