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-2+a=-2+2a
We simplify the equation to the form, which is simple to understand
-2+a=-2+2a
We move all terms containing a to the left and all other terms to the right.
+1a-2a=-2+2
We simplify left and right side of the equation.
-1a=0
We divide both sides of the equation by -1 to get a.
a=-0
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