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w in (-oo:+oo)
109 = 4*w+7*w+10 // - 4*w+7*w+10
109-(4*w)-(7*w)-10 = 0
109-4*w-7*w-10 = 0
99-11*w = 0 // - 99
-11*w = -99 // : -11
w = -99/(-11)
w = 9
w = 9
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