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7z-3z=-9z-2-z
We simplify the equation to the form, which is simple to understand
7z-3z=-9z-2-z
We move all terms containing z to the left and all other terms to the right.
+7z-3z+9z+1z=-2
We simplify left and right side of the equation.
+14z=-2
We divide both sides of the equation by 14 to get z.
z=-0.14285714285714
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