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b in (-oo:+oo)
4.0557 = 2.3*(1/3)*b // - 2.3*(1/3)*b
4.0557-(2.3*(1/3)*b) = 0
4.0557-0.76666667*b = 0
4.0557-0.76666667*b = 0 // - 4.0557
-0.76666667*b = -4.0557 // : -0.76666667
b = -4.0557/(-0.76666667)
b = 5.29004346
b = 5.29004346
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