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x in (-oo:+oo)
y = (-4/5)*x+16 // - (-4/5)*x+16
y-((-4/5)*x)-16 = 0
(4/5)*x+y-16 = 0
4/5*x+y-16 = 0 // - y-16
4/5*x = -(y-16) // : 4/5
x = (-(y-16))/4/5
x = 5/4*(16-y)
x = 5/4*(16-y)
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