Question
$$-13 = 1+3x+4x$$
Answer
$$ x = -2 $$
Explanation
$$ \begin{aligned} -13 &= 1+3x+4x&& \text{simplify right side} \\[1 em]-13 &= 7x+1&& \text{ swap the left and right side of the equation } \\[1 em]7x+1 &= -13&& \text{ move 1 to the right } \\[1 em]7x &= -13-1&& \\[1 em]7x &= -14&& \text{ divide both sides by $ 7 $ } \\[1 em]x &= -\frac{14}{7}&& \\[1 em]x &= -2&& \\[1 em] \end{aligned} $$
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