Ответ:

Пошаговое объяснение:

1/4*x+1/3*x

(1/4+1/3)*x

(3/12+4/12)*x

7/12*x

8/15*y-2/5*y

(8/15-2/5)*y

(8/15-6/15)*y

2/15*y

3/4*m-1/6*m

(3/4-1/6)*m

(9/12-2/12)*m

7/12*m