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w in (-oo:+oo)
2*(6*w+7) = -106 // + 106
2*(6*w+7)+106 = 0
2*(6*w+7)+106 = 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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