Решите уравнение:
а) 6,5x − 2,5x = 19;
б) 4,58x + 2,42x = 7,14;
в) 7,14x + 17,86x = 38;
г) 199,29x − 119,29x = 72.
6,5x − 2,5x = 19
4x = 19
x = 19 : 4
x = 4,75
4,58x + 2,42x = 7,14
7x = 7,14
x = 7,14 : 7
x = 1,02
7,14x + 17,86x = 38
25x = 38
x = 38 : 25
x = 1,52
199,29x − 119,29x = 72
80x = 72
x = 72 : 80
x = 0,9