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B in (-oo:+oo)
126 = (7/9)*B // - (7/9)*B
126-((7/9)*B) = 0
(-7/9)*B+126 = 0
126-7/9*B = 0 // - 126
-7/9*B = -126 // : -7/9
B = -126/(-7/9)
B = 162
B = 162
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