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x in (-oo:+oo)
y = b+(7/4)*x // - b+(7/4)*x
y-b-((7/4)*x) = 0
(-7/4)*x-b+y = 0
y-b-7/4*x = 0 // - y-b
-7/4*x = -(y-b) // : -7/4
x = (-(y-b))/(-7/4)
x = -4/7*(b-y)
x = -4/7*(b-y)
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