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w in (-oo:+oo)
(1/2)*w-((1/7)*w)+3 = 17/14 // - 17/14
(1/2)*w-((1/7)*w)-(17/14)+3 = 0
(1/2)*w+(-1/7)*w-17/14+3 = 0
5/14*w+25/14 = 0 // - 25/14
5/14*w = -25/14 // : 5/14
w = -25/14/5/14
w = -5
w = -5
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