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w in (-oo:+oo)
-3 = 2*w+5*w-10 // - 2*w+5*w-10
10-(2*w)-(5*w)-3 = 0
10-2*w-5*w-3 = 0
7-7*w = 0 // - 7
-7*w = -7 // : -7
w = -7/(-7)
w = 1
w = 1
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