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3+8z-7z=9
We simplify the equation to the form, which is simple to understand
3+8z-7z=9
We move all terms containing z to the left and all other terms to the right.
+8z-7z=+9-3
We simplify left and right side of the equation.
+1z=+6
We divide both sides of the equation by 1 to get z.
z=6
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