2x - 3/4x = 0,8;
2 * 4 = 8 = 2х = 8/4х
8/4х - 3/4х = 0,8;
5/4х = 0,8;
х = 0,8 / 5/4;
х = 8/10 / 5/4;
х = 8/10 * 4/5;
х = 8/5 * 2/5;
х = 16/25;
х = 0,64.
2x - 3/4x = 0,8;
2 * 4 = 8 = 2х = 8/4х
8/4х - 3/4х = 0,8;
5/4х = 0,8;
х = 0,8 / 5/4;
х = 8/10 / 5/4;
х = 8/10 * 4/5;
х = 8/5 * 2/5;
х = 16/25;
х = 0,64.