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b in (-oo:+oo)
(6/35)*b = 36/5 // - 36/5
(6/35)*b-(36/5) = 0
(6/35)*b-36/5 = 0
6/35*b-36/5 = 0 // + 36/5
6/35*b = 36/5 // : 6/35
b = 36/5/6/35
b = 42
b = 42
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