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x in (-oo:+oo)
y = (7/3)*x+1/3 // - (7/3)*x+1/3
y-((7/3)*x)-(1/3) = 0
(-7/3)*x+y-1/3 = 0
y-7/3*x-1/3 = 0 // - y-1/3
-7/3*x = -(y-1/3) // : -7/3
x = (-(y-1/3))/(-7/3)
x = -3/7*(1/3-y)
x = -3/7*(1/3-y)
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