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x in (-oo:+oo)
y = (1/2)*x-(7/2) // - (1/2)*x-(7/2)
y-((1/2)*x)+7/2 = 0
(-1/2)*x+y+7/2 = 0
y-1/2*x+7/2 = 0 // - y+7/2
-1/2*x = -(y+7/2) // : -1/2
x = (-(y+7/2))/(-1/2)
x = 2*(y+7/2)
x = 2*(y+7/2)
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