$$\frac { 2 x } { 3 x + 1 } = - 3$$
$x=-\frac{3}{11}\approx -0.272727273$
$$2x=-3\left(3x+1\right)$$
$$2x=-9x-3$$
$$2x+9x=-3$$
$$11x=-3$$
$$x=\frac{-3}{11}$$
$$x=-\frac{3}{11}$$
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