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-2z+8=21+4z
We simplify the equation to the form, which is simple to understand
-2z+8=21+4z
We move all terms containing z to the left and all other terms to the right.
-2z-4z=+21-8
We simplify left and right side of the equation.
-6z=+13
We divide both sides of the equation by -6 to get z.
z=-2.16666666667
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