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w in (-oo:+oo)
-8.7 = w/4-2.3 // - w/4-2.3
2.3-(w/4)-8.7 = 0
-1/4*w-6.4 = 0 // + 6.4
-1/4*w = 6.4 // : -1/4
w = 6.4/(-1/4)
w = -25.6
w = -25.6
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