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w in (-oo:+oo)
(2*w+3)/5+(6*w+6)/7 = 9 // - 9
(2*w+3)/5+(6*w+6)/7-9 = 0
(7*(2*w+3))/(5*7)+(5*(6*w+6))/(5*7)+(-9*5*7)/(5*7) = 0
7*(2*w+3)+5*(6*w+6)-9*5*7 = 0
44*w-315+51 = 0
44*w-264 = 0
(44*w-264)/(5*7) = 0
(44*w-264)/(5*7) = 0 // * 5*7
44*w-264 = 0
44*w-264 = 0 // + 264
44*w = 264 // : 44
w = 264/44
w = 6
w = 6
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