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b in (-oo:+oo)
35.594 = 7.8*(1/3)*b // - 7.8*(1/3)*b
35.594-(7.8*(1/3)*b) = 0
35.594-2.6*b = 0
35.594-2.6*b = 0 // - 35.594
-2.6*b = -35.594 // : -2.6
b = -35.594/(-2.6)
b = 13.69
b = 13.69
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