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