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x in (-oo:+oo)
y+1 = (1/3)*(x-3) // - (1/3)*(x-3)
y-((1/3)*(x-3))+1 = 0
(-1/3)*(x-3)+y+1 = 0
y-1/3*(x-3)+1 = 0
y-1/3*(x-3)+1 = 0
y-1/3*x+1+1 = 0
y-1/3*x+2 = 0
y-1/3*x+2 = 0
y-1/3*x+2 = 0 // - y+2
-1/3*x = -(y+2) // : -1/3
x = (-(y+2))/(-1/3)
x = 3*(y+2)
x = 3*(y+2)
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