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1z-z+12=1z+2z
We simplify the equation to the form, which is simple to understand
1z-z+12=1z+2z
We move all terms containing z to the left and all other terms to the right.
+1z-1z-1z-2z=-12
We simplify left and right side of the equation.
-3z=-12
We divide both sides of the equation by -3 to get z.
z=4
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