The solution to the problem is as follows:
(5+x)(5-x) = 7
You know that (a+b)(a-b)=a^2 - b^2
So, 25 - x^2 = 7
(or) -x^2 + 18 = 0
(or) x^2 - 18 = 0
So, A=1, B=0 and C= -18
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