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b in (-oo:+oo)
(52/7)*b-(9/10) = (4/5)*b // - (4/5)*b
(52/7)*b-((4/5)*b)-(9/10) = 0
(52/7)*b+(-4/5)*b-9/10 = 0
232/35*b-9/10 = 0 // + 9/10
232/35*b = 9/10 // : 232/35
b = 9/10/232/35
b = 63/464
b = 63/464
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