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w in (-oo:+oo)
(9/7)*w = -2/3 // + -2/3
(9/7)*w-(-2/3) = 0
(9/7)*w+2/3 = 0
9/7*w+2/3 = 0 // - 2/3
9/7*w = -2/3 // : 9/7
w = -2/3/9/7
w = -14/27
w = -14/27
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