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b in (-oo:+oo)
13 = (4/3)*b // - (4/3)*b
13-((4/3)*b) = 0
(-4/3)*b+13 = 0
13-4/3*b = 0 // - 13
-4/3*b = -13 // : -4/3
b = -13/(-4/3)
b = 39/4
b = 39/4
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