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B in (-oo:+oo)
42 = (6/3)*B // - (6/3)*B
42-((6/3)*B) = 0
42-2*B = 0
42-2*B = 0 // - 42
-2*B = -42 // : -2
B = -42/(-2)
B = 21
B = 21
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