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b in (-oo:+oo)
(1/3)*b-2 = -67/30 // + -67/30
(1/3)*b-(-67/30)-2 = 0
(1/3)*b+67/30-2 = 0
1/3*b+7/30 = 0 // - 7/30
1/3*b = -7/30 // : 1/3
b = -7/30/1/3
b = -7/10
b = -7/10
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