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w in (-oo:+oo)
w/5-(1/2) = w/6 // - w/6
w/5-(w/6)-(1/2) = 0
w/5-(w/6)-1/2 = 0
1/30*w-1/2 = 0 // + 1/2
1/30*w = 1/2 // : 1/30
w = 1/2/1/30
w = 15
w = 15
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