Question

решите уравнение (4/5 - х)+ 13/20 = 25/30

Answer 1

(4/5-x)+13/20 = 5/6
29/20 - x = 5/6
 x=37/60 или 0.62 

Answer 2

(4/5-х)+13/20=25/30
4/5-х=25/30-13/20
4/5-х=50/60-39/60
4/5-х=11/60
х=4/5-11/60
х=48/60-11/60
х=37/60