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6z-9-12-15z=6
We simplify the equation to the form, which is simple to understand
6z-9-12-15z=6
We move all terms containing z to the left and all other terms to the right.
+6z-15z=+6+9+12
We simplify left and right side of the equation.
-9z=+27
We divide both sides of the equation by -9 to get z.
z=-3
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