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w in (-oo:+oo)
7*w-(5*w)-9 = 3 // - 3
7*w-(5*w)-9-3 = 0
7*w-5*w-9-3 = 0
2*w-12 = 0 // + 12
2*w = 12 // : 2
w = 12/2
w = 6
w = 6
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