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b in (-oo:+oo)
(1/5)*b = 1/30 // - 1/30
(1/5)*b-(1/30) = 0
(1/5)*b-1/30 = 0
1/5*b-1/30 = 0 // + 1/30
1/5*b = 1/30 // : 1/5
b = 1/30/1/5
b = 1/6
b = 1/6
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