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x in (-oo:+oo)
x = (1/2)*(16-(8*y)) // - (1/2)*(16-(8*y))
x-((1/2)*(16-(8*y))) = 0
(-1/2)*(16-8*y)+x = 0
x-1/2*(16-8*y) = 0
x-1/2*(16-8*y) = 0
x+4*y-8 = 0
x+4*y-8 = 0
x+4*y-8 = 0 // - 4*y-8
x = -(4*y-8)
x = 8-(4*y)
x = 8-(4*y)
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