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w in (-oo:+oo)
4*(3*w+9) = 120 // - 120
4*(3*w+9)-120 = 0
4*(3*w+9)-120 = 0
12*w-84 = 0
12*w-84 = 0
12*w-84 = 0 // + 84
12*w = 84 // : 12
w = 84/12
w = 7
w = 7
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