Question

4/15x+2,8=6,3-3/20x

Answer 1

4/15x + 3/20x = 6.3 - 2.8
5/12x = 3.5
x = 3.5  /  5/12
x = 8.4

Answer 2

4/15х + 2,8 = 6,3 - 3/20х;
4/15х + 3/20х = 6,3 - 2,8;
16/60х + 9/60х = 3,5;
5/12х =3,5;
х = 35/10 ÷ 5/12
х = 35/10 × 12/5
х = (7 × 6)/5
х = 84/10
х = 8,4
Ответ: 8,4