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Help me find the answer for this problem, please.

Help me find the answer for this problem, please.-example-1
User Omatt
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f(x+a)-f(x)=√(x+a+7)+7-(\sqrt {x+7}+7})\\ f(x+a)-f(x)=√(x+a+7)+7-\sqrt {x+7}-7}\\ f(x+a)-f(x)=√(x+a+7)-\sqrt {x+7}
User Alan Hinchcliffe
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