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b in (-oo:+oo)
3-(2/9) = (1/3)*b-7 // - (1/3)*b-7
3-((1/3)*b)-(2/9)+7 = 0
(-1/3)*b-2/9+3+7 = 0
88/9-1/3*b = 0 // - 88/9
-1/3*b = -88/9 // : -1/3
b = -88/9/(-1/3)
b = 88/3
b = 88/3
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