$$3 b - 12 = 7 b + 10$$
$b = -\frac{11}{2} = -5\frac{1}{2} = -5.5$
$$3b-12-7b=10$$
$$-4b-12=10$$
$$-4b=10+12$$
$$-4b=22$$
$$b=\frac{22}{-4}$$
$$b=-\frac{11}{2}$$
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