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15/2*4 = 30
2.866666666666667 times.
7 and 1/2 * 3 and 1/4 = 15/2*13/4=24 and 3/8
(3/7)(10/13)(14/15)=(4/13).
x^2-15x+14=0 Delta = (-15)^2-4*1*14 = 169 = 13^2 so x=(15-13)/2=1 or x=(15+13)/2=14