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b in (-oo:+oo)
-6 = b+10*(-5/8) // - b+10*(-5/8)
-b-(10*(-5/8))-6 = 0
25/4-b-6 = 0
1/4-b = 0 // - 1/4
-b = -1/4 // * -1
b = 1/4
b = 1/4
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