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y in (-oo:+oo)
-y-5 = (1/2)*(8-(4*y)) // - (1/2)*(8-(4*y))
-((1/2)*(8-(4*y)))-y-5 = 0
(-1/2)*(8-4*y)-y-5 = 0
-1/2*(8-4*y)-y-5 = 0
-1/2*(8-4*y)-y-5 = 0
y-5-4 = 0
y-9 = 0
y-9 = 0
y-9 = 0 // + 9
y = 9
y = 9
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