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