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a^{2}=\left(a-1\right)a+\left(a-1\right)\left(-1\right)
Variable a cannot be equal to 1 since division by zero is not defined. Multiply both sides of the equation by a-1.
a^{2}=a^{2}-a+\left(a-1\right)\left(-1\right)
Use the distributive property to multiply a-1 by a.
a^{2}=a^{2}-a-a+1
Use the distributive property to multiply a-1 by -1.
a^{2}=a^{2}-2a+1
Combine -a and -a to get -2a.
a^{2}-a^{2}=-2a+1
Subtract a^{2} from both sides.
0=-2a+1
Combine a^{2} and -a^{2} to get 0.
-2a+1=0
Swap sides so that all variable terms are on the left hand side.
-2a=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
a=\frac{-1}{-2}
Divide both sides by -2.
a=\frac{1}{2}
Fraction \frac{-1}{-2} can be simplified to \frac{1}{2} by removing the negative sign from both the numerator and the denominator.