$$8x+4=3(x(-1)+7$$
$x = \frac{17}{11} = 1\frac{6}{11} \approx 1.545454545$
$$8x+4=3x\left(-1\right)+21$$
$$8x+4=-3x+21$$
$$8x+4+3x=21$$
$$11x+4=21$$
$$11x=21-4$$
$$11x=17$$
$$x=\frac{17}{11}$$
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