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w in (-oo:+oo)
3*(2-5*w) = -99 // + 99
3*(2-5*w)+99 = 0
3*(2-5*w)+99 = 0
105-15*w = 0
105-15*w = 0
105-15*w = 0 // - 105
-15*w = -105 // : -15
w = -105/(-15)
w = 7
w = 7
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