Step-by-step explanation:
So here, we know
[tex]k = \frac{5}{6} x - \frac{2}{5} [/tex]
and
[tex]m = \frac{1}{3} + \frac{7}{2} x[/tex]
So that means
[tex]3k = 3( \frac{5}{6} x - \frac{2}{5} ) = \frac{15}{6} x - \frac{6}{5} = \frac{5}{2} x - \frac{6}{5} [/tex]
And
[tex]4m = 4( \frac{1}{3} + \frac{7}{2} x) = \frac{4}{3} + \frac{28}{2} x = \frac{4}{3} + 14x[/tex]
Therefore,
[tex]3k + 4m = (\frac{5}{2} x - \frac{6}{5} ) + \frac{4}{3} + 14x = ( \frac{5}{2} x + 14 x) + ( \frac{4}{3} - \frac{6}{5} ) = 16 \frac{1}{2} + \frac{2}{15} [/tex]
