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Answer:
[tex]a=10.5[/tex]
Step-by-step explanation:
[tex]2.25(a+1.3)=20.7\\2.25a+2.925=20.7\\-2.925\\2.25a=23.625\\[/tex]
÷[tex]2.25[/tex]
[tex]a=10.5[/tex]