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12=\left(x+2\right)\left(-1\right)
Variable x 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(x-2\right)\left(x+2\right), the least common multiple of x^{2}-4,x-2.
12=-x-2
Use the distributive property to multiply x+2 by -1.
-x-2=12
Swap sides so that all variable terms are on the left hand side.
-x=12+2
Add 2 to both sides.
-x=14
Add 12 and 2 to get 14.
x=-14
Multiply both sides by -1.