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5(z-4)=20
We simplify the equation to the form, which is simple to understand
5(z-4)=20
Reorder the terms in parentheses
+(+5z-20)=20
Remove unnecessary parentheses
+5z-20=+20
We move all terms containing z to the left and all other terms to the right.
+5z=+20+20
We simplify left and right side of the equation.
+5z=+40
We divide both sides of the equation by 5 to get z.
z=8
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