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b in (-oo:+oo)
(4/3)*b = -20/3 // + -20/3
(4/3)*b-(-20/3) = 0
(4/3)*b+20/3 = 0
4/3*b+20/3 = 0 // - 20/3
4/3*b = -20/3 // : 4/3
b = -20/3/4/3
b = -5
b = -5
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