$\frac{2}{3}$+ $\frac{7}{4}$:x= $\frac{5}{6}$
$\frac{7}{4}$:x=$\frac{5}{6}$ -$\frac{2}{3}$
$\frac{7}{4}$:x=$\frac{5}{6}$ -$\frac{4}{6}$
$\frac{7}{4}$:x=$\frac{1}{6}$
x=$\frac{7}{4}$:$\frac{1}{6}$
x=$\frac{7}{4}$.6
x=$\frac{21}{2}$
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