(18+x*72/60)+(17-x*90/60)=46,2
(18+x*72/60)+(17-x*90/60)=46,2 18+x*72/60+17-x*90/60=46,2 Х*90/60-х*72/60= 18+17-46 1/5 18/60*х= 34 5/5-46 1/5 3/10*х= -12 4/5 Х= -64/5:3/10 Х= -64/5*10/3 Х= -128/3= -42 2/3