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w in (-oo:+oo)
6*w+1/2 = -7/4 // + -7/4
6*w+1/2-(-7/4) = 0
6*w+1/2+7/4 = 0
6*w+9/4 = 0 // - 9/4
6*w = -9/4 // : 6
w = -9/4/6
w = -3/8
w = -3/8
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