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[tex]\\ \sf\longmapsto \dfrac{21.5}{5}-\dfrac{1}{5}\times (20.5-5.5)+5.5(8)[/tex]
[tex]\\ \sf\longmapsto 4.3-0.2\times 15+44[/tex]
[tex]\\ \sf\longmapsto 1.3+44[/tex]
[tex]\\ \sf\longmapsto 45.3[/tex]