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b in (-oo:+oo)
5-((2/5)*b) = 7/5 // - 7/5
5-((2/5)*b)-(7/5) = 0
(-2/5)*b-7/5+5 = 0
18/5-2/5*b = 0 // - 18/5
-2/5*b = -18/5 // : -2/5
b = -18/5/(-2/5)
b = 9
b = 9
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