Ответ: ↓

[tex](2x + 1.2)(x + 1)(0.7x + 0.21) = 0[/tex]

Решим по отдельности:

[tex]2x + 1.2 = 0 \\ 2x = - 1.2 \\ x = - 0.6[/tex]

[tex]x + 1 = 0 \\ x = - 1[/tex]

[tex]0.7x + 0.21 = 0 \\ 0.7x = - 0.21 \\ x = - 0.3[/tex]