$$\frac { 15 } { 1 } = \frac { 5 a + 40 } { 6 }$$
$a=10$
$$6\times 15=5a+40$$
$$90=5a+40$$
$$5a+40=90$$
$$5a=90-40$$
$$5a=50$$
$$a=\frac{50}{5}$$
$$a=10$$
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