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