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