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b in (-oo:+oo)
(3/7)*b+10 = 79/7 // - 79/7
(3/7)*b-(79/7)+10 = 0
(3/7)*b-79/7+10 = 0
3/7*b-9/7 = 0 // + 9/7
3/7*b = 9/7 // : 3/7
b = 9/7/3/7
b = 3
b = 3
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