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x in (-oo:+oo)
y = (5/3)*x-(2/3) // - (5/3)*x-(2/3)
y-((5/3)*x)+2/3 = 0
(-5/3)*x+y+2/3 = 0
y-5/3*x+2/3 = 0 // - y+2/3
-5/3*x = -(y+2/3) // : -5/3
x = (-(y+2/3))/(-5/3)
x = 3/5*(y+2/3)
x = 3/5*(y+2/3)
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