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x in (-oo:+oo)
y = b+(-5/3)*x // - b+(-5/3)*x
y-b-((-5/3)*x) = 0
(5/3)*x-b+y = 0
5/3*x-b+y = 0 // - y-b
5/3*x = -(y-b) // : 5/3
x = (-(y-b))/5/3
x = 3/5*(b-y)
x = 3/5*(b-y)
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