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b in (-oo:+oo)
b/5-2.1 = -27 // + 27
b/5-2.1+27 = 0
1/5*b+24.9 = 0 // - 24.9
1/5*b = -24.9 // : 1/5
b = -24.9/1/5
b = -124.5
b = -124.5
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