$$ \begin{aligned} 1 &= x\cdot2-6x&& \text{simplify right side} \\[1 em]1 &= x\cdot2-6x&& \\[1 em]1 &= -4x&& \text{ swap the left and right side of the equation } \\[1 em]-4x &= 1&& \text{ divide both sides by $ -4 $ } \\[1 em]x &= -\frac{1}{4}&& \\[1 em] \end{aligned} $$