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