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x in (-oo:+oo)
y = x/5-(1/2) // - x/5-(1/2)
y-(x/5)+1/2 = 0
y-1/5*x+1/2 = 0 // - y+1/2
-1/5*x = -(y+1/2) // : -1/5
x = (-(y+1/2))/(-1/5)
x = 5*(y+1/2)
x = 5*(y+1/2)
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