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w in (-oo:+oo)
(1/2)*w-(4/3) = -9/5 // + -9/5
(1/2)*w-(4/3)-(-9/5) = 0
(1/2)*w-4/3+9/5 = 0
1/2*w+7/15 = 0 // - 7/15
1/2*w = -7/15 // : 1/2
w = -7/15/1/2
w = -14/15
w = -14/15
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