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x in (-oo:+oo)
y = (1/2)*x-18 // - (1/2)*x-18
y-((1/2)*x)+18 = 0
(-1/2)*x+y+18 = 0
y-1/2*x+18 = 0 // - y+18
-1/2*x = -(y+18) // : -1/2
x = (-(y+18))/(-1/2)
x = 2*(y+18)
x = 2*(y+18)
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