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w in (-oo:+oo)
(9/7)*w-(1/2) = -7/5 // + -7/5
(9/7)*w-(1/2)-(-7/5) = 0
(9/7)*w-1/2+7/5 = 0
9/7*w+9/10 = 0 // - 9/10
9/7*w = -9/10 // : 9/7
w = -9/10/9/7
w = -7/10
w = -7/10
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