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w in (-oo:+oo)
(5/7)*w = -50/7 // + -50/7
(5/7)*w-(-50/7) = 0
(5/7)*w+50/7 = 0
5/7*w+50/7 = 0 // - 50/7
5/7*w = -50/7 // : 5/7
w = -50/7/5/7
w = -10
w = -10
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