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b in (-oo:+oo)
(5/2)*b+25/5 = 10 // - 10
(5/2)*b+25/5-10 = 0
5/2*b-5 = 0 // + 5
5/2*b = 5 // : 5/2
b = 5/5/2
b = 2
b = 2
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