Question
$$x\cdot3-6x\cdot2-135x-400 = 0$$
Answer
$$ x = -\dfrac{25}{9} $$
Explanation
$$ \begin{aligned} x\cdot3-6x\cdot2-135x-400 &= 0&& \text{simplify left side} \\[1 em]3x-12x-135x-400 &= 0&& \\[1 em]-144x-400 &= 0&& \text{ move the constants to the right } \\[1 em]-144x &= 400&& \text{ divide both sides by $ -144 $ } \\[1 em]x &= -\frac{400}{144}&& \\[1 em]x &= -\frac{25}{9}&& \\[1 em] \end{aligned} $$
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