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b in (-oo:+oo)
1989 = 7.4*(1/3)*b // - 7.4*(1/3)*b
1989-(7.4*(1/3)*b) = 0
1989-2.46666667*b = 0
1989-2.46666667*b = 0 // - 1989
-2.46666667*b = -1989 // : -2.46666667
b = -1989/(-2.46666667)
b = 806.35135026
b = 806.35135026
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