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w in (-oo:+oo)
3 = (w-3)/2 // - (w-3)/2
3-((w-3)/2) = 0
(-1*(w-3))/2+3 = 0
(-1*(w-3))/2+(2*3)/2 = 0
2*3-1*(w-3) = 0
9-w = 0
(9-w)/2 = 0
(9-w)/2 = 0 // * 2
9-w = 0
9-w = 0 // - 9
-w = -9 // * -1
w = 9
w = 9
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