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2z+12z-4z=0
We simplify the equation to the form, which is simple to understand
2z+12z-4z=0
We move all terms containing z to the left and all other terms to the right.
+2z+12z-4z=0
We simplify left and right side of the equation.
+10z=0
We divide both sides of the equation by 10 to get z.
z=0
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