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1/2a-4a=0
We simplify the equation to the form, which is simple to understand
1/2a-4a=0
We move all terms containing a to the left and all other terms to the right.
+2a-4a=0
We simplify left and right side of the equation.
-2a=0
We divide both sides of the equation by -2 to get a.
a=-0
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