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b in (-oo:+oo)
1989.5147 = 7.4*(1/3)*b // - 7.4*(1/3)*b
1989.5147-(7.4*(1/3)*b) = 0
1989.5147-2.46666667*b = 0
1989.5147-2.46666667*b = 0 // - 1989.5147
-2.46666667*b = -1989.5147 // : -2.46666667
b = -1989.5147/(-2.46666667)
b = 806.56001242
b = 806.56001242
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