12.2+(-7 2/5)+(-4 5/6)+(-39 1/2)+50 помогите решить

12.2+(-7 2/5)+(-4 5/6)+(-39 1/2)+50;-7 2/5=-7.4;-39 1/2=39.5;12.2+50-7.4-39.5=15.3;15.3-(4 5/6)=15 18/60 - 4 50/60= 10 28/60 =10 7/15;