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