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w in (-oo:+oo)
4*(3*w-9) = 84 // - 84
4*(3*w-9)-84 = 0
4*(3*w-9)-84 = 0
12*w-120 = 0
12*w-120 = 0
12*w-120 = 0 // + 120
12*w = 120 // : 12
w = 120/12
w = 10
w = 10
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