Question: numeric calculation2

Tank you "Preben Alsholm". Your solution is very nice. But I have a question. When I use

implicitplot(eq(x), x=0..10)

for myself equation, I have a plot with 2 lines where have symmetry with respect to x-axis, but when I use your notation I only have the line under x-axis. Why?

For my physically work I need the upper line.

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