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a^2-b^2 = (a+b)(a-b)

4x^2 -25 =0

(2x)^2-5^2 =0

(2x-5) (2x+5)=0

2x-5=0 or 2x+5 =0

2x=5 or 2x=-5

x=5/2 or x=-5/2

x=2.5 or -2.5

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