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w in (-oo:+oo)
3*(4*w-5) = 9 // - 9
3*(4*w-5)-9 = 0
3*(4*w-5)-9 = 0
12*w-24 = 0
12*w-24 = 0
12*w-24 = 0 // + 24
12*w = 24 // : 12
w = 24/12
w = 2
w = 2
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