Решить уравнение (дробь1/4+1/5 )*x=1 4/5 (2 1/12 - 1 5/6)*x=3/4

(1/4+1/5 )*x=1 4/5 

 5+4                 9
  *  x =
  20                  5

9/20 * x = 9/5
x = 9/5 : 9/20
x = 9/5 * 20/9
x = 4

(1/4+1/5)*4=9/5 ili 1 4/5

(2 1/12 - 1 5/6)*x=3/4

25-22/12 * x = 3/4

3/12 * x = 3/4
x = 3/4 : 3/12
x  = 3/4 * 12/3
x = 3

(2 1/12 - 1 5/6)*3=3/4

Решение на первое равенство.