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9z-3z=-3z-9-z
We simplify the equation to the form, which is simple to understand
9z-3z=-3z-9-z
We move all terms containing z to the left and all other terms to the right.
+9z-3z+3z+1z=-9
We simplify left and right side of the equation.
+10z=-9
We divide both sides of the equation by 10 to get z.
z=-0.9
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