[tex]\frac{15-(-3)\cdot4}{-12+7} +\frac{8-6}{6-7} =\frac{15-(-12)}{-5}+\frac{2}{-1} = \frac{15+12}{-5}-2 = -\frac{27}{5}-2 = -5\frac{2}{5}-2 = -7\frac{2}{5} = -7,4[/tex]
