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b in (-oo:+oo)
2 = b/2.5 // - b/2.5
2-(b/2.5) = 0
2-0.4*b = 0
2-0.4*b = 0 // - 2
-0.4*b = -2 // : -0.4
b = -2/(-0.4)
b = 5
b = 5
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