$$-150 = 11-3n$$
Answer
$$ n = \frac{161}{3} $$
Explanation
$$ \begin{aligned} -150 &= 11-3n&& \text{ swap the left and right side of the equation } \\[1 em]11-3n &= -150&& \text{ move 11 to the right } \\[1 em]-3n &= -150-11&& \\[1 em]-3n &= -161&& \text{ divide both sides by $ -3 $ } \\[1 em]n &= \frac{-161}{-3}&& \\[1 em]n &= \frac{161}{3}&& \\[1 em] \end{aligned} $$
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