$$84+6+7x7-8\times5+29=4$$
$x_{7} = -\frac{75}{7} = -10\frac{5}{7} \approx -10.714285714$
$$90+7x_{7}-8\times 5+29=4$$
$$90+7x_{7}-40+29=4$$
$$50+7x_{7}+29=4$$
$$79+7x_{7}=4$$
$$7x_{7}=4-79$$
$$7x_{7}=-75$$
$$x_{7}=\frac{-75}{7}$$
$$x_{7}=-\frac{75}{7}$$
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