| $$ \begin{aligned}2.62\cdot\frac{0.229}{0.246+0.378x}-1& \xlongequal{ }2.62\cdot\frac{0.229}{0.246+0x}-1 \xlongequal{ } \\[1 em] & \xlongequal{ }2.62\cdot0-1 \xlongequal{ } \\[1 em] & \xlongequal{ }0-1 \xlongequal{ } \\[1 em] & \xlongequal{ }-1\end{aligned} $$ |