Solve for z
z = -\frac{20}{7} = -2\frac{6}{7} \approx -2.857142857
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9z-40-23z=0
Subtract 23z from both sides.
-14z-40=0
Combine 9z and -23z to get -14z.
-14z=40
Add 40 to both sides. Anything plus zero gives itself.
z=\frac{40}{-14}
Divide both sides by -14.
z=-\frac{20}{7}
Reduce the fraction \frac{40}{-14} to lowest terms by extracting and canceling out 2.
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