Ononot — If \frac{A}{x-4} + \frac{B}{x+3} = \frac{7x-7}{x^2-x-12}, fi

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Rational Expressionshard

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If $\frac{A}{x-4} + \frac{B}{x+3} = \frac{7x-7}{x^2-x-12}$ , find $A+B$ .