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2\sqrt{7}=2\sqrt{7}
Factor 28=2^{2}\times 7. Rewrite the square root of the product \sqrt{2^{2}\times 7} as the product of square roots \sqrt{2^{2}}\sqrt{7}. Take the square root of 2^{2}.
2\sqrt{7}-2\sqrt{7}=0
Subtract 2\sqrt{7} from both sides.
0=0
Combine 2\sqrt{7} and -2\sqrt{7} to get 0.
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Compare 0 and 0.
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