$$\left. \begin{array} { l } { 49 x + 51 y = 499 } \end{array} \right.$$
$x=\frac{499-51y}{49}$
$$49x=499-51y$$
$$\frac{49x}{49}=\frac{499-51y}{49}$$
$$x=\frac{499-51y}{49}$$
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