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