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w in (-oo:+oo)
4/5-3*w-(7*w) = 62/15 // - 62/15
4/5-3*w-(7*w)-(62/15) = 0
4/5-3*w-7*w-62/15 = 0
-10*w-10/3 = 0 // + 10/3
-10*w = 10/3 // : -10
w = 10/3/(-10)
w = -1/3
w = -1/3
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