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y in (-oo:+oo)
y = (12-y)/10 // - (12-y)/10
y-((12-y)/10) = 0
(-1*(12-y))/10+y = 0
(-1*(12-y))/10+(10*y)/10 = 0
10*y-1*(12-y) = 0
11*y-12 = 0
(11*y-12)/10 = 0
(11*y-12)/10 = 0 // * 10
11*y-12 = 0
11*y-12 = 0 // + 12
11*y = 12 // : 11
y = 12/11
y = 12/11
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