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Let f(x)=3x^2-7x+c , where c is a variab...

Let `f(x)=3x^2-7x+c ,` where `c` is a variable coefficient and `x >7/6` . Then the value of `[c]` such that `f(x)` touches `f^(-1)(x)` is (where [.] represents greatest integer function)_________

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