`b) 64 : (2/3 – x)^3 = (2/3 – x) : 4`

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1. b) 64:(2/3-x)^3=(2/3-x):4

   ⇔ (2/3-x)^3 . (2/3-x)=64.4

   ⇔ (2/3-x)^4=4^4

   ⇔ $\left[\begin{matrix} \frac{2}{3}-x=4\\ \frac{2}{3}-x=-4\end{matrix}\right.$

   ⇔ $\left[\begin{matrix} x=\frac{2}{3}-4\\ x=\frac{2}{3}+4\end{matrix}\right.$

   ⇔ $\left[\begin{matrix} x=\frac{-10}{3}\\ x=\frac{14}{3}\end{matrix}\right.$

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