6a^2+4a+5+3a^2+7a-2
That is the same thing as 9a^2+11a+3, but what is the question? You have just written an algebraic expression, not an equation to be solved.
assuming you are required to factorise the equation and the expression give by drwls it factorises to
(9a+3)(a+1)
hope this helps
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