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w in (-oo:+oo)
-23 = 3*w+(1/2)*w-9 // - 3*w+(1/2)*w-9
9-(3*w)-((1/2)*w)-23 = 0
(-1/2)*w-3*w-23+9 = 0
-7/2*w-14 = 0 // + 14
-7/2*w = 14 // : -7/2
w = 14/(-7/2)
w = -4
w = -4
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