–81,4b+90b–7,15b+0,45b=(–81,4+90–7,15+0,45)b=(–88,55+90,45)b=1,9b.
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–81,4b+90b–7,15b+0,45b=(–81,4+90–7,15+0,45)b=(–88,55+90,45)b=1,9b.