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((z-3))=12
We simplify the equation to the form, which is simple to understand
((z-3))=12
Simplifying terms in parentheses
((-3+1z))=12
Remove unnecessary parentheses
(0-3+1z)=12
Simplifying terms in parentheses
(0-3+1z)=12
Remove unnecessary parentheses
0-3+1z=12
We move all terms containing z to the left and all other terms to the right.
+1z=+12-0-0+3
We simplify left and right side of the equation.
+1z=+15
We divide both sides of the equation by 1 to get z.
z=15
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