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2a-4=4a-(2a+4)
We simplify the equation to the form, which is simple to understand
2a-4=4a-(2a+4)
Remove unnecessary parentheses
2a-4=4a-2a-4
We move all terms containing a to the left and all other terms to the right.
+2a-4a+2a=-4+4
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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