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w in (-oo:+oo)
41 = 5*w+4*w-4 // - 5*w+4*w-4
4-(5*w)-(4*w)+41 = 0
4-5*w-4*w+41 = 0
45-9*w = 0 // - 45
-9*w = -45 // : -9
w = -45/(-9)
w = 5
w = 5
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