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b in (-oo:+oo)
(2/3)*b+2/5 = 49/60 // - 49/60
(2/3)*b+2/5-(49/60) = 0
(2/3)*b+2/5-49/60 = 0
2/3*b-5/12 = 0 // + 5/12
2/3*b = 5/12 // : 2/3
b = 5/12/2/3
b = 5/8
b = 5/8
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