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Mathematics 24 Online
OpenStudy (anonymous):

Medals?

OpenStudy (anonymous):

15. x^2+6x+1=0 16. x^2-5x-6=0 17. x^2-2x+9=0 18. 4x^2-4x=-1 19. 6x^2+5x-2=-3 20. (2x-5)^2=121

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