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b in (-oo:+oo)
3/5-7*b = 79/15 // - 79/15
3/5-7*b-(79/15) = 0
3/5-7*b-79/15 = 0
-7*b-14/3 = 0 // + 14/3
-7*b = 14/3 // : -7
b = 14/3/(-7)
b = -2/3
b = -2/3
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