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