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a in (-oo:+oo)
11 = (16-a)/3 // - (16-a)/3
11-((16-a)/3) = 0
(-1*(16-a))/3+11 = 0
(-1*(16-a))/3+(3*11)/3 = 0
3*11-1*(16-a) = 0
a+17 = 0
(a+17)/3 = 0
(a+17)/3 = 0 // * 3
a+17 = 0
a+17 = 0 // - 17
a = -17
a = -17
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