$$\left. \begin{array} { l } { \frac { y } { 3 } - \frac { 3 } { 4 } = \frac { 1 } { 2 } } \end{array} \right.$$
$y = \frac{15}{4} = 3\frac{3}{4} = 3.75$
$$4y-9=6$$
$$4y=6+9$$
$$4y=15$$
$$y=\frac{15}{4}$$
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