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x in (-oo:+oo)
x = 10-(y/2) // - 10-(y/2)
x+y/2-10 = 0
x+1/2*y-10 = 0 // - 1/2*y-10
x = -(1/2*y-10)
x = 10-(1/2*y)
x = 10-(1/2*y)
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