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a-6+\left(a-2\right)\left(a+1\right)=a^{2}-2a-24
Variable a cannot be equal to any of the values -2,2 since division by zero is not defined. Multiply both sides of the equation by \left(a-2\right)\left(a+2\right), the least common multiple of a^{2}-4,a+2.
a-6+a^{2}-a-2=a^{2}-2a-24
Use the distributive property to multiply a-2 by a+1 and combine like terms.
-6+a^{2}-2=a^{2}-2a-24
Combine a and -a to get 0.
-8+a^{2}=a^{2}-2a-24
Subtract 2 from -6 to get -8.
-8+a^{2}-a^{2}=-2a-24
Subtract a^{2} from both sides.
-8=-2a-24
Combine a^{2} and -a^{2} to get 0.
-2a-24=-8
Swap sides so that all variable terms are on the left hand side.
-2a=-8+24
Add 24 to both sides.
-2a=16
Add -8 and 24 to get 16.
a=\frac{16}{-2}
Divide both sides by -2.
a=-8
Divide 16 by -2 to get -8.