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w in (-oo:+oo)
6*(3-1*w) = -48 // + 48
6*(3-1*w)+48 = 0
6*(3-w)+48 = 0
6*(3-w)+48 = 0
66-6*w = 0
66-6*w = 0
66-6*w = 0 // - 66
-6*w = -66 // : -6
w = -66/(-6)
w = 11
w = 11
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