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w in (-oo:+oo)
7*w+7/8 = (4/7)*w+3289/56 // - (4/7)*w+3289/56
7*w-((4/7)*w)+7/8-(3289/56) = 0
7*w+(-4/7)*w+7/8-3289/56 = 0
45/7*w-405/7 = 0 // + 405/7
45/7*w = 405/7 // : 45/7
w = 405/7/45/7
w = 9
w = 9
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