$$\frac{ 7x+15 }{ 9 } = \frac{ 18x+15 }{ 15 }$$
$x = \frac{30}{19} = 1\frac{11}{19} \approx 1.578947368$
$$5\left(7x+15\right)=3\left(18x+15\right)$$
$$35x+75=3\left(18x+15\right)$$
$$35x+75=54x+45$$
$$35x+75-54x=45$$
$$-19x+75=45$$
$$-19x=45-75$$
$$-19x=-30$$
$$x=\frac{-30}{-19}$$
$$x=\frac{30}{19}$$
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