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