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b in (-oo:+oo)
(5/7)*b+7*b+10 = 64 // - 64
(5/7)*b+7*b-64+10 = 0
54/7*b-54 = 0 // + 54
54/7*b = 54 // : 54/7
b = 54/54/7
b = 7
b = 7
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