Помогите плииз: задания в фотографии.

1/2 m-8m-3m= -(8+3-1/2)m= - 10 1/2 m= - 10.5m -0.4y - 2y+2/5 y= -0.4y-2y+0.5y= - 1.9y 5/6 z - 1 3/4 z+13/18 z=30/36 z - 1 27/36 z+26/36 z=1 20/36 - 1 27/36= - 7/36 -0.24+1 1/4 n+0.12+1.25n= - 0.24+1.25n+0.12+1.25n=2.5n-0.12 1/5 y - (3y-4/5)+4=0.2y-3y+0.8+4=4.8 - 2.8y 1/3 b(a-b) -a(1-3b)=1/3 ab - 1/3 b² -a +3ab=3 1/3 ab - a - 1/3 b² 22.4(5/16 x - 3/7) -35.1(9/13 x - 4/9)=56/25 * 5/16 x - 56/25 * 3/7 - 351/10 * 9/13 x +351/10 * 4/9=7/10 х  - 24/25 - 243/10 х + 156/10=0,7х - 0,96 - 24,3х+15,6=14,64 - 23,6х