given is: a²+2=3⅔+3-⅔
prove that: 3a²+9a=8
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a² + 2 = 3⅔ + 3 - ⅔
a² + 2 = 2+3-⅔ = 5 - ⅔
a² + 2 = 13/3
a² = 13/3 - 2 = 7/3
a = √7/3
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