x + 18 = 43; x - 24 = 37; 36 - x = 12; x × 5 = 40; 54 : x = 6.

Решение

\( x + 18 = 43 \)

\( x = 43 - 18 \)

\( x = 25 \)

\( x - 24 = 37 \)

\( x = 37 + 24 \)

\( x = 61 \)

\( 36 - x = 12 \)

\( x = 36 - 12 \)

\( x = 24 \)

\( x \times 5 = 40 \)

\( x = 40 : 5 \)

\( x = 8 \)

\( 54 : x = 6 \)

\( x = 54 : 6 \)

\( x = 9 \)

Ответ: x = 25, x = 61, x = 24, x = 8, x = 9.