Решение:
- а) 6x + 18 = 0
\( 6x = -18 \)
\( x = \frac{-18}{6} \)
\( x = -3 \) - б) 2x + 3 = 3x - 2
\( 3 + 2 = 3x - 2x \)
\( 5 = x \) - в) 3(5 – x) = 11 + 2x
\( 15 - 3x = 11 + 2x \)
\( 15 - 11 = 2x + 3x \)
\( 4 = 5x \)
\( x = \frac{4}{5} \)
\( x = 0.8 \)
Ответ: а) x = -3; б) x = 5; в) x = 0.8.