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