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w in (-oo:+oo)
-45 = 2*w-7*w-10 // - 2*w-7*w-10
10-(-7*w)-(2*w)-45 = 0
7*w-2*w-45+10 = 0
5*w-35 = 0 // + 35
5*w = 35 // : 5
w = 35/5
w = 7
w = 7
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