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w in (-oo:+oo)
74/7 = 5*w-2*w+8 // - 5*w-2*w+8
74/7-(-2*w)-(5*w)-8 = 0
2*w-5*w+74/7-8 = 0
18/7-3*w = 0 // - 18/7
-3*w = -18/7 // : -3
w = -18/7/(-3)
w = 6/7
w = 6/7
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