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w in (-oo:+oo)
7*w-9 = 4-6*w // - 4-6*w
7*w-(-6*w)-9-4 = 0
7*w+6*w-9-4 = 0
13*w-13 = 0 // + 13
13*w = 13 // : 13
w = 13/13
w = 1
w = 1
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