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-2z+4=16
We simplify the equation to the form, which is simple to understand
-2z+4=16
We move all terms containing z to the left and all other terms to the right.
-2z=+16-4
We simplify left and right side of the equation.
-2z=+12
We divide both sides of the equation by -2 to get z.
z=-6
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