$$ \begin{aligned} 5x-898 &= 4x+963&& \text{move the $ \color{blue}{ 4x } $ to the left side and $ \color{blue}{ -898 }$ to the right} \\[1 em]5x-4x &= 963+898&& \text{simplify left and right hand side} \\[1 em]x &= 1861&& \\[1 em]x &= 1861&& \\[1 em] \end{aligned} $$