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w in (-oo:+oo)
(3/7)*w-6 = -40/7 // + -40/7
(3/7)*w-(-40/7)-6 = 0
(3/7)*w+40/7-6 = 0
3/7*w-2/7 = 0 // + 2/7
3/7*w = 2/7 // : 3/7
w = 2/7/3/7
w = 2/3
w = 2/3
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