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var('x,l')
solve(0==(x-l)+exp(-x), x)
var('x,l') implicit_plot((x-l)+exp(-x),(l,-5,15),(x,-10,15))
@interact def _(l=(-10..10)): (plot((x-l),(x,-3,3))+plot(exp(-x),(x,-3,3))).show()
[removed]