2) Найдите неизвестный компонент равенства:
- 5x + 3 = 13
5x = 13 - 3
5x = 10
x = 10 : 5
x = 2
- 9(a - 3) = 18
a - 3 = 18 : 9
a - 3 = 2
a = 2 + 3
a = 5
- 18 + (3a - 4) = 19
3a - 4 = 19 - 18
3a - 4 = 1
3a = 1 + 4
3a = 5
a = 5/3
a = 1 2/3
- 25 : (y - 6) = 5
y - 6 = 25 : 5
y - 6 = 5
y = 5 + 6
y = 11
Ответ: а) x = 2; b) a = 5; c) a = 1 2/3; d) y = 11