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w in (-oo:+oo)
5*w-9 = 2*w+15 // - 2*w+15
5*w-(2*w)-15-9 = 0
5*w-2*w-15-9 = 0
3*w-24 = 0 // + 24
3*w = 24 // : 3
w = 24/3
w = 8
w = 8
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