let limit as x\to6 of f(x)=4, limit as x\to6 of g(x)=9, calcule limit as x\to6 of [g(x)-f(x)]let limit as x\to6 of f(x)=4, limit as x\to6 of g(x)=9, calcule limit as x\to6 of [g(x)-f(x)]

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