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w in (-oo:+oo)
3*(4*w+1) = 15 // - 15
3*(4*w+1)-15 = 0
3*(4*w+1)-15 = 0
12*w-12 = 0
12*w-12 = 0
12*w-12 = 0 // + 12
12*w = 12 // : 12
w = 12/12
w = 1
w = 1
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