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b in (-oo:+oo)
(4*(3-b))/5 = 1.6 // - 1.6
(4*(3-b))/5-1.6 = 0
(4*(3-b))/5+(-1.6*5)/5 = 0
4*(3-b)-1.6*5 = 0
4-4*b = 0
(4-4*b)/5 = 0
(4-4*b)/5 = 0 // * 5
4-4*b = 0
4-4*b = 0 // - 4
-4*b = -4 // : -4
b = -4/(-4)
b = 1
b = 1
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