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3(z+4)=0
We simplify the equation to the form, which is simple to understand
3(z+4)=0
Reorder the terms in parentheses
+(+3z+12)=0
Remove unnecessary parentheses
+3z+12=0
We move all terms containing z to the left and all other terms to the right.
+3z=0-12
We simplify left and right side of the equation.
+3z=-12
We divide both sides of the equation by 3 to get z.
z=-4
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