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w in (-oo:+oo)
-39 = -6*w-(5*w)-6 // + -6*w-(5*w)-6
5*w-(-6*w)-39+6 = 0
6*w+5*w-39+6 = 0
11*w-33 = 0 // + 33
11*w = 33 // : 11
w = 33/11
w = 3
w = 3
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