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x in (-oo:+oo)
y = b+(3/4)*x // - b+(3/4)*x
y-b-((3/4)*x) = 0
(-3/4)*x-b+y = 0
y-b-3/4*x = 0 // - y-b
-3/4*x = -(y-b) // : -3/4
x = (-(y-b))/(-3/4)
x = -4/3*(b-y)
x = -4/3*(b-y)
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