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w in (-oo:+oo)
-(6*w)-9 = -75 // + 75
75-(6*w)-9 = 0
75-6*w-9 = 0
66-6*w = 0 // - 66
-6*w = -66 // : -6
w = -66/(-6)
w = 11
w = 11
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