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b in (-oo:+oo)
(2/3)*b = -4/1 // + -4/1
(2/3)*b-(-4/1) = 0
(2/3)*b+4 = 0
2/3*b+4 = 0 // - 4
2/3*b = -4 // : 2/3
b = -4/2/3
b = -6
b = -6
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