$$ \begin{aligned} 49 &= 2x-4+x+5+x&& \text{simplify right side} \\[1 em]49 &= 3x+1+x&& \\[1 em]49 &= 4x+1&& \text{ swap the left and right side of the equation } \\[1 em]4x+1 &= 49&& \text{ move 1 to the right } \\[1 em]4x &= 49-1&& \\[1 em]4x &= 48&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{48}{4}&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$

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