Solve for z
z=-1
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5-7z-3z=15
Subtract 3z from both sides.
5-10z=15
Combine -7z and -3z to get -10z.
-10z=15-5
Subtract 5 from both sides.
-10z=10
Subtract 5 from 15 to get 10.
z=\frac{10}{-10}
Divide both sides by -10.
z=-1
Divide 10 by -10 to get -1.
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