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[tex]\it a)\ \ \ =-135:5+4\cdot2=-27+8=-19\\ \\ \\ b)\ \ =-\dfrac{^{5)}7}{\ 9}+\dfrac{^{9)}2}{5}-\dfrac{^{3)}1}{15}-\dfrac{2}{45}=\dfrac{-35+18-3-2}{45}=\dfrac{18-40}{45}=-\dfrac{22}{45}[/tex]