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b in (-oo:+oo)
8-((2/9)*b) = (1/3)*b-7 // - (1/3)*b-7
7-((2/9)*b)-((1/3)*b)+8 = 0
(-2/9)*b+(-1/3)*b+7+8 = 0
15-5/9*b = 0 // - 15
-5/9*b = -15 // : -5/9
b = -15/(-5/9)
b = 27
b = 27
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