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w in (-oo:+oo)
7*(3*w+5) = -49 // + 49
7*(3*w+5)+49 = 0
7*(3*w+5)+49 = 0
21*w+84 = 0
21*w+84 = 0
21*w+84 = 0 // - 84
21*w = -84 // : 21
w = -84/21
w = -4
w = -4
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