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-5z-2z=-31
We simplify the equation to the form, which is simple to understand
-5z-2z=-31
We move all terms containing z to the left and all other terms to the right.
-5z-2z=-31
We simplify left and right side of the equation.
-7z=-31
We divide both sides of the equation by -7 to get z.
z=4.4285714285714
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