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The given function  f(x) = 6x + 7.

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The value of function f(m)

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Substitute value f(m) in above function.

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f(m) = 6(m) + 7   

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         = 6m + 7                               (Multiply: 6(m) = 6m)        

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The value of  f(m) = 6m + 7.