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w in (-oo:+oo)
3*(4-5*w) = -3 // + 3
3*(4-5*w)+3 = 0
3*(4-5*w)+3 = 0
15-15*w = 0
15-15*w = 0
15-15*w = 0 // - 15
-15*w = -15 // : -15
w = -15/(-15)
w = 1
w = 1
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