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B in (-oo:+oo)
(B-9)/3 = 15 // - 15
(B-9)/3-15 = 0
(B-9)/3+(-15*3)/3 = 0
B-15*3-9 = 0
B-54 = 0
(B-54)/3 = 0
(B-54)/3 = 0 // * 3
B-54 = 0
B-54 = 0 // + 54
B = 54
B = 54
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