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a+a+a+a=4a
We simplify the equation to the form, which is simple to understand
a+a+a+a=4a
We move all terms containing a to the left and all other terms to the right.
+1a+1a+1a+1a-4a=0
We simplify left and right side of the equation.
a=0
0=0
This equation is an identity, so all real numbers are solutions.
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