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4a-(2a+4)=0
We simplify the equation to the form, which is simple to understand
4a-(2a+4)=0
Remove unnecessary parentheses
4a-2a-4=0
We move all terms containing a to the left and all other terms to the right.
+4a-2a=0+4
We simplify left and right side of the equation.
+2a=+4
We divide both sides of the equation by 2 to get a.
a=2
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