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b in (-oo:+oo)
(1/56)*b-(2/5) = -2 // + 2
(1/56)*b-(2/5)+2 = 0
(1/56)*b-2/5+2 = 0
1/56*b+8/5 = 0 // - 8/5
1/56*b = -8/5 // : 1/56
b = -8/5/1/56
b = -448/5
b = -448/5
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