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21/95

Hello Guest!

-3/4+2/5=-1/3u - 5/4u

- 3/4 + 2/5 = - 1/3u - 5/4u

(- 15 + 8) / 20 = (- 4 - 15) / 12u

- 7/20 = - 19 / 12u

12u = - 19 * 20 / - 7

u = 380 / (7 * 12)

u = 380 / 84

u = 95 / 21 = 4.5238

Greeting asinus :- )  !