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