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B in (-oo:+oo)
B/5 = 6.9 // - 6.9
B/5-6.9 = 0
1/5*B-6.9 = 0 // + 6.9
1/5*B = 6.9 // : 1/5
B = 6.9/1/5
B = 34.5
B = 34.5
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