Solve for z
z=10
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8-4z+42=z
Use the distributive property to multiply -2 by 2z-21.
50-4z=z
Add 8 and 42 to get 50.
50-4z-z=0
Subtract z from both sides.
50-5z=0
Combine -4z and -z to get -5z.
-5z=-50
Subtract 50 from both sides. Anything subtracted from zero gives its negation.
z=\frac{-50}{-5}
Divide both sides by -5.
z=10
Divide -50 by -5 to get 10.
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Limits
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