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w in (-oo:+oo)
3*w-9 = 126/5-((4/5)*w) // - 126/5-((4/5)*w)
3*w+(4/5)*w-(126/5)-9 = 0
3*w+(4/5)*w-126/5-9 = 0
19/5*w-171/5 = 0 // + 171/5
19/5*w = 171/5 // : 19/5
w = 171/5/19/5
w = 9
w = 9
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