$$ \begin{aligned} 5 &= \frac{3}{1}(7x-9)&& \text{simplify right side} \\[1 em]5 &= 3(7x-9)&& \\[1 em]5 &= 21x-27&& \text{ swap the left and right side of the equation } \\[1 em]21x-27 &= 5&& \text{ move -27 to the right } \\[1 em]21x &= 5+27&& \\[1 em]21x &= 32&& \text{ divide both sides by $ 21 $ } \\[1 em]x &= \frac{32}{21}&& \\[1 em] \end{aligned} $$

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