$$ \begin{aligned}\frac{3x^2-14-24}{12+2x}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{3x^2-38}{12+2x}\end{aligned} $$ | |
① | $$ 3x^2 \color{blue}{-14} \color{blue}{-24} = 3x^2 \color{blue}{-38} $$ |