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w in (-oo:+oo)
w-7*w-(7/8) = -203/40 // + -203/40
w-7*w-(7/8)-(-203/40) = 0
w-7*w-7/8+203/40 = 0
21/5-6*w = 0 // - 21/5
-6*w = -21/5 // : -6
w = -21/5/(-6)
w = 7/10
w = 7/10
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