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w in (-oo:+oo)
15 = 7*w+w+6/4-(9/2) // - 7*w+w+6/4-(9/2)
9/2-(7*w)-w-(6/4)+15 = 0
9/2-7*w-w-3/2+15 = 0
18-8*w = 0 // - 18
-8*w = -18 // : -8
w = -18/(-8)
w = 9/4
w = 9/4
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