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a-2-\left(-a\times 3\right)=4
Variable a cannot be equal to any of the values 0,2 since division by zero is not defined. Multiply both sides of the equation by a\left(a-2\right), the least common multiple of a,2-a,a^{2}-2a.
a-2-\left(-3a\right)=4
Multiply -1 and 3 to get -3.
a-2+3a=4
The opposite of -3a is 3a.
4a-2=4
Combine a and 3a to get 4a.
4a=4+2
Add 2 to both sides.
4a=6
Add 4 and 2 to get 6.
a=\frac{6}{4}
Divide both sides by 4.
a=\frac{3}{2}
Reduce the fraction \frac{6}{4} to lowest terms by extracting and canceling out 2.