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3z-9z=4z-2
We simplify the equation to the form, which is simple to understand
3z-9z=4z-2
We move all terms containing z to the left and all other terms to the right.
+3z-9z-4z=-2
We simplify left and right side of the equation.
-10z=-2
We divide both sides of the equation by -10 to get z.
z=0.2
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