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x in (-oo:+oo)
y = x/3+5/6 // - x/3+5/6
y-(x/3)-(5/6) = 0
y-(x/3)-5/6 = 0
y-1/3*x-5/6 = 0 // - y-5/6
-1/3*x = -(y-5/6) // : -1/3
x = (-(y-5/6))/(-1/3)
x = -3*(5/6-y)
x = -3*(5/6-y)
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