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\frac{x+9}{x-3}-\frac{6\left(x+3\right)^{2}}{\left(x^{2}-9\right)\times 6}-\frac{3x-3}{x-3}
Divide \frac{6}{x^{2}-9} by \frac{6}{\left(x+3\right)^{2}} by multiplying \frac{6}{x^{2}-9} by the reciprocal of \frac{6}{\left(x+3\right)^{2}}.
\frac{x+9}{x-3}-\frac{\left(x+3\right)^{2}}{x^{2}-9}-\frac{3x-3}{x-3}
Cancel out 6 in both numerator and denominator.
\frac{x+9}{x-3}-\frac{\left(x+3\right)^{2}}{\left(x-3\right)\left(x+3\right)}-\frac{3x-3}{x-3}
Factor the expressions that are not already factored in \frac{\left(x+3\right)^{2}}{x^{2}-9}.
\frac{x+9}{x-3}-\frac{x+3}{x-3}-\frac{3x-3}{x-3}
Cancel out x+3 in both numerator and denominator.
\frac{x+9-\left(x+3\right)}{x-3}-\frac{3x-3}{x-3}
Since \frac{x+9}{x-3} and \frac{x+3}{x-3} have the same denominator, subtract them by subtracting their numerators.
\frac{x+9-x-3}{x-3}-\frac{3x-3}{x-3}
Do the multiplications in x+9-\left(x+3\right).
\frac{6}{x-3}-\frac{3x-3}{x-3}
Combine like terms in x+9-x-3.
\frac{6-\left(3x-3\right)}{x-3}
Since \frac{6}{x-3} and \frac{3x-3}{x-3} have the same denominator, subtract them by subtracting their numerators.
\frac{6-3x+3}{x-3}
Do the multiplications in 6-\left(3x-3\right).
\frac{9-3x}{x-3}
Combine like terms in 6-3x+3.
\frac{3\left(-x+3\right)}{x-3}
Factor the expressions that are not already factored in \frac{9-3x}{x-3}.
\frac{-3\left(x-3\right)}{x-3}
Extract the negative sign in 3-x.
-3
Cancel out x-3 in both numerator and denominator.