[tex](7 + 2x)(0.3x - 1.2)( \frac{4}{7} x + 56) = 0[/tex]

[tex]7 + 2x = 0 \\ 2x = - 7 \\ x = - \frac{7}{2} \\ x = - 3.5[/tex]

[tex]0.3x - 1.2 = 0 \\ 0.3x = 1.2 \\ x = \frac{1.2}{0.3} \\ x = 4[/tex]

[tex] \frac{4}{7} x + 56 = 0 \\ \frac{4}{7} x = - 56 \\ x = - 56 \times \frac{7}{4} \\ x = - 98[/tex]