i did 15b wrong... can someone show me how to do it correctly thanks
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Hello, you didn't factor correctly the denominator of the 2nd fraction. The 2nd line should read: $\displaystyle \frac{x+1}{x+6}-\frac{(x-2)(x+2)}{\color{red}x(x+2)\color{black}} \cdot \frac{x(2x+1)}{(2x+1)(x+3)}$
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