Question

21/x-4=21/4 решите уравнение

Answer 1

21/х - 4 = 21/4
21/х = 21/4 + 4 
21/х= 21/4 +16/4
21/х= 37/4
х= 21 : 37/4 
х=  21 * 4/37 = 84/37 = 2 10/37