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b in (-oo:+oo)
12-((6/5)*b) = 5 // - 5
12-((6/5)*b)-5 = 0
(-6/5)*b-5+12 = 0
7-6/5*b = 0 // - 7
-6/5*b = -7 // : -6/5
b = -7/(-6/5)
b = 35/6
b = 35/6
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