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w in (-oo:+oo)
3*(7*w+4) = 159 // - 159
3*(7*w+4)-159 = 0
3*(7*w+4)-159 = 0
21*w-147 = 0
21*w-147 = 0
21*w-147 = 0 // + 147
21*w = 147 // : 21
w = 147/21
w = 7
w = 7
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