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9z+9+3z=7z-12+1
We simplify the equation to the form, which is simple to understand
9z+9+3z=7z-12+1
We move all terms containing z to the left and all other terms to the right.
+9z+3z-7z=-12+1-9
We simplify left and right side of the equation.
+5z=-20
We divide both sides of the equation by 5 to get z.
z=-4
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