$$\left. \begin{array} { l } { 1 } \\ { 5 ( x + 1 ) = 4 ( x + 3 ) } \end{array} \right.$$
$y=1$
$$5x+5=4\left(x+3\right)$$
$$5x+5=4x+12$$
$$5x+5-4x=12$$
$$x+5=12$$
$$x=12-5$$
$$x=7$$
$$x=7$$ $$y=1$$
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