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2\sqrt{7}-\sqrt{63}+\sqrt{7}=0
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}-3\sqrt{7}+\sqrt{7}=0
Factor 63=3^{2}\times 7. Rewrite the square root of the product \sqrt{3^{2}\times 7} as the product of square roots \sqrt{3^{2}}\sqrt{7}. Take the square root of 3^{2}.
-\sqrt{7}+\sqrt{7}=0
Combine 2\sqrt{7} and -3\sqrt{7} to get -\sqrt{7}.
0=0
Combine -\sqrt{7} and \sqrt{7} to get 0.
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Compare 0 and 0.
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