$$ \begin{aligned} 9(x+3) &= 4x\cdot77&& \text{simplify left and right hand side} \\[1 em]9x+27 &= 308x&& \text{move the $ \color{blue}{ 308x } $ to the left side and $ \color{blue}{ 27 }$ to the right} \\[1 em]9x-308x &= -27&& \text{simplify left side} \\[1 em]-299x &= -27&& \text{ divide both sides by $ -299 $ } \\[1 em]x &= \frac{-27}{-299}&& \\[1 em]x &= \frac{27}{299}&& \\[1 em] \end{aligned} $$

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