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w in (-oo:+oo)
5-6 = (w-5)/4 // - (w-5)/4
5-((w-5)/4)-6 = 0
(-1*(w-5))/4-6+5 = 0
(-1*(w-5))/4+(-6*4)/4+(4*5)/4 = 0
4*5-1*(w-5)-6*4 = 0
20-w-19 = 0
1-w = 0
(1-w)/4 = 0
(1-w)/4 = 0 // * 4
1-w = 0
1-w = 0 // - 1
-w = -1 // * -1
w = 1
w = 1
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