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b in (-oo:+oo)
(2/3)*b-7 = -125/18 // + -125/18
(2/3)*b-(-125/18)-7 = 0
(2/3)*b+125/18-7 = 0
2/3*b-1/18 = 0 // + 1/18
2/3*b = 1/18 // : 2/3
b = 1/18/2/3
b = 1/12
b = 1/12
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