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w in (-oo:+oo)
4*(3*w+6) = 60 // - 60
4*(3*w+6)-60 = 0
4*(3*w+6)-60 = 0
12*w-36 = 0
12*w-36 = 0
12*w-36 = 0 // + 36
12*w = 36 // : 12
w = 36/12
w = 3
w = 3
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