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x in (-oo:+oo)
y = b+(10/500)*x // - b+(10/500)*x
y-b-((10/500)*x) = 0
(-1/50)*x-b+y = 0
y-b-1/50*x = 0 // - y-b
-1/50*x = -(y-b) // : -1/50
x = (-(y-b))/(-1/50)
x = -50*(b-y)
x = -50*(b-y)
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