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w in (-oo:+oo)
(5/7)*w+2*w+5 = 150/49 // - 150/49
(5/7)*w+2*w-(150/49)+5 = 0
(5/7)*w+2*w-150/49+5 = 0
19/7*w+95/49 = 0 // - 95/49
19/7*w = -95/49 // : 19/7
w = -95/49/19/7
w = -5/7
w = -5/7
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