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-9z-9=-10z
We simplify the equation to the form, which is simple to understand
-9z-9=-10z
We move all terms containing z to the left and all other terms to the right.
-9z+10z=+9
We simplify left and right side of the equation.
+1z=+9
We divide both sides of the equation by 1 to get z.
z=9
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