Book Maths Puzzle Algebra

How do you solve "6/t^2-17/t+5=0" using substitution to factor?

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Book Other Question

22 ft x 8 ft sidewalk, 22 stepping stones 16 in x 16 in, 2 inches in depth, gravel cost is 2.99 a cubic foot. How many bags of gravel will it take? what is the total cost of the gravel? Round to the nearest decimal. I need help on a proprtion,

2u-3/4u=u-1/u I did cross product method on this one and i got

2u(squared)-3u= 4u (squared)-4u then i isolated the u and the u (squared) and came out with u=2u(squared). I think i did this all right, but i'm not sure what the u would be. I missed this lesson in math becuase i'm on homebound school because of an illness i have. If you can please help me out i would appreciate it. Thank You.