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b in (-oo:+oo)
-13 = (4-b)/3 // - (4-b)/3
-((4-b)/3)-13 = 0
(-1*(4-b))/3-13 = 0
(-1*(4-b))/3+(-13*3)/3 = 0
-1*(4-b)-13*3 = 0
b-43 = 0
(b-43)/3 = 0
(b-43)/3 = 0 // * 3
b-43 = 0
b-43 = 0 // + 43
b = 43
b = 43
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