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b in (-oo:+oo)
(-1/3)*b+6 = 170/27 // - 170/27
(-1/3)*b-(170/27)+6 = 0
(-1/3)*b-170/27+6 = 0
-1/3*b-8/27 = 0 // + 8/27
-1/3*b = 8/27 // : -1/3
b = 8/27/(-1/3)
b = -8/9
b = -8/9
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