$$\frac{7}{15}x+3=\frac{3}{5}$$
$x = -\frac{36}{7} = -5\frac{1}{7} \approx -5.142857143$
$$\frac{7}{15}x=\frac{3}{5}-3$$
$$\frac{7}{15}x=\frac{3}{5}-\frac{15}{5}$$
$$\frac{7}{15}x=\frac{3-15}{5}$$
$$\frac{7}{15}x=-\frac{12}{5}$$
$$x=-\frac{12}{5}\times \frac{15}{7}$$
$$x=\frac{-12\times 15}{5\times 7}$$
$$x=\frac{-180}{35}$$
$$x=-\frac{36}{7}$$
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