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B in (-oo:+oo)
7-((1/3)*B) = 10 // - 10
7-((1/3)*B)-10 = 0
(-1/3)*B-10+7 = 0
-1/3*B-3 = 0 // + 3
-1/3*B = 3 // : -1/3
B = 3/(-1/3)
B = -9
B = -9
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