$$\frac{ x }{ 3 } = \frac{ 7 }{ 4 } (x+8)$$
$x = -\frac{168}{17} = -9\frac{15}{17} \approx -9.882352941$
$$4x=21\left(x+8\right)$$
$$4x=21x+168$$
$$4x-21x=168$$
$$-17x=168$$
$$x=\frac{168}{-17}$$
$$x=-\frac{168}{17}$$
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