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1-a^{2}+aa+a\left(-3\right)=11a
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by a.
1-a^{2}+a^{2}+a\left(-3\right)=11a
Multiply a and a to get a^{2}.
1+a\left(-3\right)=11a
Combine -a^{2} and a^{2} to get 0.
1+a\left(-3\right)-11a=0
Subtract 11a from both sides.
1-14a=0
Combine a\left(-3\right) and -11a to get -14a.
-14a=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
a=\frac{-1}{-14}
Divide both sides by -14.
a=\frac{1}{14}
Fraction \frac{-1}{-14} can be simplified to \frac{1}{14} by removing the negative sign from both the numerator and the denominator.