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x in (-oo:+oo)
y = (4/1)*x+5 // - (4/1)*x+5
y-((4/1)*x)-5 = 0
y-4*x-5 = 0
y-4*x-5 = 0 // - y-5
-4*x = -(y-5) // : -4
x = (-(y-5))/(-4)
x = (5-y)/(-4)
x = (5-y)/(-4)
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