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