[tex]8 \frac{1}{2} - (a - 3.1) = 8.5 - a + 3.1 = \\ 11.6 - a = 11.6 - ( - 3.6) = \\ 11.6 + 3.6 = 15.2[/tex]
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[tex]8 \frac{1}{2} - (a - 3.1) = 8.5 - a + 3.1 = \\ 11.6 - a = 11.6 - ( - 3.6) = \\ 11.6 + 3.6 = 15.2[/tex]