Question

15-72:(а-3)=9 решить

Answer 1

15-72:(а-3)=9;

72:(a-3) = 15 - 9;

(a-3) = 72:6;

a-3 = 12;

a = 15;

Answer 2

числит - 72      - 6
знамен a - 3 =   1

- 6( a - 3) = - 72
- 6a + 18 = - 72
- 6a = - 18 - 72
- 6a = - 90
a = 15

Ответ: a = 15