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w in (-oo:+oo)
6-5*w = 4*w+15 // - 4*w+15
6-5*w-(4*w)-15 = 0
6-5*w-4*w-15 = 0
-9*w-9 = 0 // + 9
-9*w = 9 // : -9
w = 9/(-9)
w = -1
w = -1
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