$$\left. \begin{array} { l } { \frac { x + 1 } { 3 } = \frac { 7 } { 4 } } \end{array} \right.$$
$x = \frac{17}{4} = 4\frac{1}{4} = 4.25$
$$x+1=\frac{7}{4}\times 3$$
$$x+1=\frac{7\times 3}{4}$$
$$x+1=\frac{21}{4}$$
$$x=\frac{21}{4}-1$$
$$x=\frac{21}{4}-\frac{4}{4}$$
$$x=\frac{21-4}{4}$$
$$x=\frac{17}{4}$$
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