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x in (-oo:+oo)
y = 5*x-(8/2) // - 5*x-(8/2)
y-(5*x)+8/2 = 0
y-5*x+8/2 = 0
y-5*x+4 = 0 // - y+4
-5*x = -(y+4) // : -5
x = (-(y+4))/(-5)
x = (y+4)/5
x = (y+4)/5
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