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b in (-oo:+oo)
(2/5)*b+2/3 = 14/3 // - 14/3
(2/5)*b+2/3-(14/3) = 0
(2/5)*b+2/3-14/3 = 0
2/5*b-4 = 0 // + 4
2/5*b = 4 // : 2/5
b = 4/2/5
b = 10
b = 10
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