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-7(9-3z)=23
We simplify the equation to the form, which is simple to understand
-7(9-3z)=23
Reorder the terms in parentheses
+(-63+21z)=23
Remove unnecessary parentheses
-63+21z=+23
We move all terms containing z to the left and all other terms to the right.
+21z=+23+63
We simplify left and right side of the equation.
+21z=+86
We divide both sides of the equation by 21 to get z.
z=4.0952380952381
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