$$ \begin{aligned} 3x+4 &= 2x-3&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]3x-2x &= -3-4&& \text{simplify left and right hand side} \\[1 em]x &= -7&& \\[1 em]x &= -7&& \\[1 em] \end{aligned} $$