Multiply both sides of the equation by a common multiple of $2$ and $6$ to get rid of the fractions.

$6\left(\frac{{\it x}}{2}+\frac{{\it x}}{6}=7\right)$

$3x+x=42$

Combine like terms.

$4x=42$

Divide both sides by $4$.

$x=10.5$

Follow the steps in part (a).

${\it x} = \frac{3}{10}$