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-4+2a=2a-6
We simplify the equation to the form, which is simple to understand
-4+2a=2a-6
We move all terms containing a to the left and all other terms to the right.
+2a-2a=-6+4
We simplify left and right side of the equation.
a=-2
0=-2
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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