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w in (-oo:+oo)
3*(7*w-5) = -183 // + 183
3*(7*w-5)+183 = 0
3*(7*w-5)+183 = 0
21*w+168 = 0
21*w+168 = 0
21*w+168 = 0 // - 168
21*w = -168 // : 21
w = -168/21
w = -8
w = -8
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