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