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12z=8z-4+3z
We simplify the equation to the form, which is simple to understand
12z=8z-4+3z
We move all terms containing z to the left and all other terms to the right.
+12z-8z-3z=-4
We simplify left and right side of the equation.
+1z=-4
We divide both sides of the equation by 1 to get z.
z=-4
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