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y in (-oo:+oo)
y/(-1) = 2.09 // - 2.09
y/(-1)-2.09 = 0
-y-2.09 = 0
-y-2.09 = 0 // + 2.09
-y = 2.09 // * -1
y = -2.09
y = -2.09
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