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