помогите решить 2,3/4-(-1,1/2)+(-5/6)-(-3/8)-4,2/3=

2 3/4-(-1 1/2)+(-5/6)-(-3/8)-4 2/3= -7/8
2 3/4-(-1 1/2)=2 3/4+1 1/2=2 3/4+1 2/4=3 5/4=4 1/4
4 1/4+(-5/6)=4 1/4-5/6=4 3/12-10/12=3 15/12-10/12=3 5/12
3 5/12-(-3/8)=3 5/12+3/8=3 10/24+9/24=3 19/24
3 19/24-4 2/3=3 19/24-4 16/24=-(4 16/24-3 19/24)=-(3 40/24-3 19/24)=-21/24=-7/8