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b in (-oo:+oo)
(2.9*b-5.1)/2 = 4.7 // - 4.7
(2.9*b-5.1)/2-4.7 = 0
(2.9*b-5.1)/2+(-4.7*2)/2 = 0
2.9*b-4.7*2-5.1 = 0
2.9*b-14.5 = 0
(2.9*b-14.5)/2 = 0
(2.9*b-14.5)/2 = 0 // * 2
2.9*b-14.5 = 0
2.9*b-14.5 = 0 // + 14.5
2.9*b = 14.5 // : 2.9
b = 14.5/2.9
b = 5
b = 5
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