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