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2\left(a+1\right)=2a+a-2
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2a, the least common multiple of a,2a.
2a+2=2a+a-2
Use the distributive property to multiply 2 by a+1.
2a+2=3a-2
Combine 2a and a to get 3a.
2a+2-3a=-2
Subtract 3a from both sides.
-a+2=-2
Combine 2a and -3a to get -a.
-a=-2-2
Subtract 2 from both sides.
-a=-4
Subtract 2 from -2 to get -4.
a=4
Multiply both sides by -1.