方程 $$ \begin{ aligned} 2 x + 6 &= 8 \\ 2 x &= 2 \\ x&= 1 \end{ aligned} $$ 2 x + 6 = 8 2 x = 2 x = 1 \begin{aligned} 2 x + 6 &= 8 \\ 2 x &= 2 \\ x&= 1 \end{aligned} 2x+62xx=8=2