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B in (-oo:+oo)
B/5-B-(3/10) = 7/10 // - 7/10
B/5-B-(3/10)-(7/10) = 0
B/5-B-3/10-7/10 = 0
-4/5*B-1 = 0 // + 1
-4/5*B = 1 // : -4/5
B = 1/(-4/5)
B = -5/4
B = -5/4
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