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b in (-oo:+oo)
(-1/3)*(15-(6*b)) = 4*b-13 // - 4*b-13
(-1/3)*(15-(6*b))-(4*b)+13 = 0
(-1/3)*(15-6*b)-4*b+13 = 0
13-1/3*(15-6*b)-4*b = 0
13-1/3*(15-6*b)-4*b = 0
13-2*b-5 = 0
8-2*b = 0
8-2*b = 0
8-2*b = 0 // - 8
-2*b = -8 // : -2
b = -8/(-2)
b = 4
b = 4
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