Question

$$\frac{1-ay}{19-3y}=\frac{5}{8}$$

Solve for a

$a=\frac{15}{8}-\frac{87}{8y}$
$y\neq 0\text{ and }y\neq \frac{19}{3}$

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Solve for y

$y=\frac{87}{15-8a}$
$a\neq \frac{3}{19}\text{ and }a\neq \frac{15}{8}$

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