$$\left. \begin{array} { l } { \frac { - 18 } { 15 } = \frac { 7 x } { 18 } + \frac { 33 } { 18 } = 1 } \\ { ( \frac { 5 } { 6 } \div \frac { - 4 } { 21 } ) } \end{array} \right.$$
$x = -\frac{39}{5} = -7\frac{4}{5} = -7.8$
$$6\left(-18\right)=5\times 7x+5\times 33$$
$$-108=5\times 7x+5\times 33$$
$$-108=35x+165$$
$$35x+165=-108$$
$$35x=-108-165$$
$$35x=-273$$
$$x=\frac{-273}{35}$$
$$x=-\frac{39}{5}$$
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