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b in (-oo:+oo)
7/9-(5*b) = 52/9 // - 52/9
7/9-(5*b)-(52/9) = 0
7/9-5*b-52/9 = 0
-5*b-5 = 0 // + 5
-5*b = 5 // : -5
b = 5/(-5)
b = -1
b = -1
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