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-9z-7z=-3z+3+8z
We simplify the equation to the form, which is simple to understand
-9z-7z=-3z+3+8z
We move all terms containing z to the left and all other terms to the right.
-9z-7z+3z-8z=+3
We simplify left and right side of the equation.
-21z=+3
We divide both sides of the equation by -21 to get z.
z=-0.14285714285714
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