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-8z-15=-z-6
We simplify the equation to the form, which is simple to understand
-8z-15=-z-6
We move all terms containing z to the left and all other terms to the right.
-8z+1z=-6+15
We simplify left and right side of the equation.
-7z=+9
We divide both sides of the equation by -7 to get z.
z=-1.28571428571
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