Answer
$$-1$$
Work Step by Step
Recall, one never divides by a fraction. Rather, if we want to divide by a fraction, we multiply by the reciprocal of the fraction. Recall, the reciprocal of a fraction is that fraction with the numerator and the denominator switched. Thus, we find:
$$ \frac{\left(-12+4x\right)}{12}\times \frac{6}{\left(6-2x\right)}\\ \frac{\left(-3+x\right)\times \:3}{3\left(3-x\right)}\\ -1$$