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w in (-oo:+oo)
w/21 = 17/7 // - 17/7
w/21-(17/7) = 0
w/21-17/7 = 0
1/21*w-17/7 = 0 // + 17/7
1/21*w = 17/7 // : 1/21
w = 17/7/1/21
w = 51
w = 51
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