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b in (-oo:+oo)
(2/5)*b-8.7 = -4.8 // + 4.8
(2/5)*b-8.7+4.8 = 0
2/5*b-3.9 = 0 // + 3.9
2/5*b = 3.9 // : 2/5
b = 3.9/2/5
b = 9.75
b = 9.75
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