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w in (-oo:+oo)
3*w+(1/7)*w-3 = -118/21 // + -118/21
3*w+(1/7)*w-(-118/21)-3 = 0
3*w+(1/7)*w+118/21-3 = 0
22/7*w+55/21 = 0 // - 55/21
22/7*w = -55/21 // : 22/7
w = -55/21/22/7
w = -5/6
w = -5/6
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