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x in (-oo:+oo)
y = (1/5)*x+3 // - (1/5)*x+3
y-((1/5)*x)-3 = 0
(-1/5)*x+y-3 = 0
y-1/5*x-3 = 0 // - y-3
-1/5*x = -(y-3) // : -1/5
x = (-(y-3))/(-1/5)
x = -5*(3-y)
x = -5*(3-y)
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