-17=z-21

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Solution for -17=z-21 equation:


Simplifying
-17 = z + -21

Reorder the terms:
-17 = -21 + z

Solving
-17 = -21 + z

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '-1z' to each side of the equation.
-17 + -1z = -21 + z + -1z

Combine like terms: z + -1z = 0
-17 + -1z = -21 + 0
-17 + -1z = -21

Add '17' to each side of the equation.
-17 + 17 + -1z = -21 + 17

Combine like terms: -17 + 17 = 0
0 + -1z = -21 + 17
-1z = -21 + 17

Combine like terms: -21 + 17 = -4
-1z = -4

Divide each side by '-1'.
z = 4

Simplifying
z = 4

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