\left\{ \begin{array} { l } { 150 k + b = 35 } \end{array} \right.
Solve for k, b (complex solution)
k=-\frac{b}{150}+\frac{7}{30}
b\in \mathrm{C}
Solve for k, b
k=-\frac{b}{150}+\frac{7}{30}
b\in \mathrm{R}
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