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b in (-oo:+oo)
(3/4)*b = 10/6 // - 10/6
(3/4)*b-(10/6) = 0
(3/4)*b-5/3 = 0
3/4*b-5/3 = 0 // + 5/3
3/4*b = 5/3 // : 3/4
b = 5/3/3/4
b = 20/9
b = 20/9
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