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B in (-oo:+oo)
(7/10)*B = 28/5 // - 28/5
(7/10)*B-(28/5) = 0
(7/10)*B-28/5 = 0
7/10*B-28/5 = 0 // + 28/5
7/10*B = 28/5 // : 7/10
B = 28/5/7/10
B = 8
B = 8
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