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b in (-oo:+oo)
36 = (6*b)/2 // - (6*b)/2
36-((6*b)/2) = 0
36-3*b = 0
36-3*b = 0 // - 36
-3*b = -36 // : -3
b = -36/(-3)
b = 12
b = 12
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