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-z+12-2z=3
We simplify the equation to the form, which is simple to understand
-z+12-2z=3
We move all terms containing z to the left and all other terms to the right.
-1z-2z=+3-12
We simplify left and right side of the equation.
-3z=-9
We divide both sides of the equation by -3 to get z.
z=3
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