\(a,\dfrac{x}{-3}=\dfrac{-45}{15}\\ \Rightarrow\dfrac{x}{-3}=-3\\ \Rightarrow x=\left(-3\right)\left(-3\right)\\ \Rightarrow x=9\\ b,\dfrac{1}{5}-\left(\dfrac{2}{3}-x\right)=\dfrac{-3}{5}\\ \Rightarrow\dfrac{2}{3}-x=\dfrac{1}{5}-\dfrac{-3}{5}\\ \Rightarrow\dfrac{2}{3}-x=\dfrac{4}{5}\\ \Rightarrow x=\dfrac{2}{3}-\dfrac{4}{5}\\ \Rightarrow x=\dfrac{10}{15}-\dfrac{12}{15}\\ \Rightarrow x=-\dfrac{2}{15}\)
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a,x−3=−4515⇒x−3=−3⇒x=(−3)(−3)⇒x=9b,15−(23−x)=−35⇒23−x=15−−35⇒23−x=45⇒x=23−45⇒x=1015−1215⇒x=−215
