9(x − 15) = 72
x − 15 = 72 : 9
x − 15 = 8
x = 8 + 15
x = 23
Ответ: x = 23

(3x − 8) * 16 = 448
3x − 8 = 448 : 16
3x − 8 = 28
3x = 28 + 8
3x = 36
x = 36 : 3
x = 12
Ответ: x = 12

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}448\\ \phantom{0}\underset{¯}{32}\\ \underset{¯}{\phantom{0}}128\\ \phantom{0}\underset{¯}{128}\\ \phantom{000}0\end{array}& \begin{array}{l}\overline{)16}\\ \overline{\overline{)28}}\end{array}\end{array}$

(5x + 24) : 8 = 13
5x + 24 = 13 * 8
5x + 24 = 104
5x = 104 − 24
5x = 80
x = 80 : 5
x = 16
Ответ: x = 16

Вычисления:
$\begin{array}{r}\times \underset{¯}{\begin{array}{r}13\\ 8\end{array}}\\ 104\end{array}$
 
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}80\\ \phantom{0}\underset{¯}{5}\\ \underset{¯}{\phantom{0}}30\\ \phantom{0}\underset{¯}{30}\\ \phantom{00}0\end{array}& \begin{array}{l}\overline{)5}\\ \overline{\overline{)16}}\end{array}\end{array}$

1512 : (70 − x) = 36
70 − x = 1512 : 36
70 − x = 42
x = 70 − 42
x = 28
Ответ: x = 28

Вычисления:
$\begin{array}{cc}\begin{array}{l}\underset{¯}{\phantom{0}}1512\\ \phantom{0}\underset{¯}{144}\\ \phantom{00}\underset{¯}{\phantom{0}}72\\ \phantom{000}\underset{¯}{72}\\ \phantom{0000}0\end{array}& \begin{array}{l}\overline{)36}\\ \overline{\overline{)42}}\end{array}\end{array}$

16x + x − 7x + 27 = 217
10x = 217 − 27
10x = 190
x = 190 : 10
x = 19
Ответ: x = 19

x : 4 − 8 = 12
x : 4 = 12 + 8
x : 4 = 20
x = 20 * 4
x = 80
Ответ: x = 80

48 : (x + 4) = 8
x + 4 = 48 : 8
x + 4 = 6
x = 6 − 4
x = 2
Ответ: x = 2

48 : x + 4 = 8
48 : x = 8 − 4
48 : x = 4
x = 48 : 4
x = 12
Ответ: x = 12