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w in (-oo:+oo)
(5/7)*w+3*w+3/10 = 3141/70 // - 3141/70
(5/7)*w+3*w+3/10-(3141/70) = 0
(5/7)*w+3*w+3/10-3141/70 = 0
26/7*w-312/7 = 0 // + 312/7
26/7*w = 312/7 // : 26/7
w = 312/7/26/7
w = 12
w = 12
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