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b in (-oo:+oo)
(2/7)*b+1/4 = 87/28 // - 87/28
(2/7)*b+1/4-(87/28) = 0
(2/7)*b+1/4-87/28 = 0
2/7*b-20/7 = 0 // + 20/7
2/7*b = 20/7 // : 2/7
b = 20/7/2/7
b = 10
b = 10
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