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w in (-oo:+oo)
6*(4-1*w) = 84 // - 84
6*(4-1*w)-84 = 0
6*(4-w)-84 = 0
6*(4-w)-84 = 0
-6*w-60 = 0
-6*w-60 = 0
-6*w-60 = 0 // + 60
-6*w = 60 // : -6
w = 60/(-6)
w = -10
w = -10
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