$$5x-(14-x)=-30-2x$$
$x=-2$
$$5x-14-\left(-x\right)=-30-2x$$
$$5x-14+x=-30-2x$$
$$6x-14=-30-2x$$
$$6x-14+2x=-30$$
$$8x-14=-30$$
$$8x=-30+14$$
$$8x=-16$$
$$x=\frac{-16}{8}$$
$$x=-2$$
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