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w in (-oo:+oo)
(-5/7)*w-1 = -5/14 // + -5/14
(-5/7)*w-(-5/14)-1 = 0
(-5/7)*w+5/14-1 = 0
-5/7*w-9/14 = 0 // + 9/14
-5/7*w = 9/14 // : -5/7
w = 9/14/(-5/7)
w = -9/10
w = -9/10
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