[tex]27 = 6 + 7(5 - 4x) \\ = > 27 = 6 + 35 - 28x \\ = > 28x = 6 + 35 - 27 \\ = > 28x = 14 \\ = > x = \frac{14}{28} = \frac{1}{2} = 0.5[/tex]
