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B in (-oo:+oo)
B/2 = -7/30 // + -7/30
B/2-(-7/30) = 0
B/2+7/30 = 0
1/2*B+7/30 = 0 // - 7/30
1/2*B = -7/30 // : 1/2
B = -7/30/1/2
B = -7/15
B = -7/15
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