21-4a/9-8a+15/3=2 Срочно!!!

Question

21-4a/9-8a+15/3=2
Срочно!!!

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Уравнение

Answer 1

21 + 15/3 - 2 = 4а/9 + 8а
21 + 5 - 2 = 
24 = 4а/9 + 8а/1
24 = (4а+72а)/9
24 = 76а/9
76а = 24 * 9
76а = 216
а = 216/76