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w in (-oo:+oo)
(2*(3*w-1))/2 = 18 // - 18
(2*(3*w-1))/2-18 = 0
3*w-18-1 = 0
3*w-18-1 = 0
3*w-19 = 0
3*w-19 = 0
3*w-19 = 0 // + 19
3*w = 19 // : 3
w = 19/3
w = 19/3
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