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w in (-oo:+oo)
-23 = w/3-8 // - w/3-8
8-(w/3)-23 = 0
-1/3*w-15 = 0 // + 15
-1/3*w = 15 // : -1/3
w = 15/(-1/3)
w = -45
w = -45
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