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15x^2 -2x-1=0

15x^2+5x-3x-1=0

5x(3x+1) -1(3x+1)=0

(5x-1) (3x+1) =0

5x-1 =0 or 3x+1 =0

5x=1 or 3x=-1

x=1/5 or x=-1/3

IGNORE THE PREVIOUS

15x^2-5x+3x-1=0

5x(3x-1) +1(3x-1)=0

(5x+1) (3x-1) =0

5x+1 =0 or 3x-1 =0

5x=-1 or 3x=1

x=-1/5 or x=1/3

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