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b in (-oo:+oo)
b/30 = 2.6/1.5 // - 2.6/1.5
b/30-(2.6/1.5) = 0
b/30-1.73333333 = 0
1/30*b-1.73333333 = 0 // + 1.73333333
1/30*b = 1.73333333 // : 1/30
b = 1.73333333/1/30
b = 52.0000051
b = 52.0000051
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