$$y=\frac{2}{3}(y+25)$$
$y=50$
$$y=\frac{2}{3}y+\frac{2}{3}\times 25$$
$$y=\frac{2}{3}y+\frac{2\times 25}{3}$$
$$y=\frac{2}{3}y+\frac{50}{3}$$
$$y-\frac{2}{3}y=\frac{50}{3}$$
$$\frac{1}{3}y=\frac{50}{3}$$
$$y=\frac{50}{3}\times 3$$
$$y=50$$
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