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x in (-oo:+oo)
y = x/3-(5/8) // - x/3-(5/8)
y-(x/3)+5/8 = 0
y-1/3*x+5/8 = 0 // - y+5/8
-1/3*x = -(y+5/8) // : -1/3
x = (-(y+5/8))/(-1/3)
x = 3*(y+5/8)
x = 3*(y+5/8)
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