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w in (-oo:+oo)
(1/3)*w+(5/7)*w+5 = 347/21 // - 347/21
(1/3)*w+(5/7)*w-(347/21)+5 = 0
(1/3)*w+(5/7)*w-347/21+5 = 0
22/21*w-242/21 = 0 // + 242/21
22/21*w = 242/21 // : 22/21
w = 242/21/22/21
w = 11
w = 11
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