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x in (-oo:+oo)
x/2 = y-4 // - y-4
x/2-y+4 = 0
1/2*x-y+4 = 0 // - 4-y
1/2*x = -(4-y) // : 1/2
x = (-(4-y))/1/2
x = 2*(y-4)
x = 2*(y-4)
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