21=11-2z

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Solution for 21=11-2z equation:


Simplifying
21 = 11 + -2z

Solving
21 = 11 + -2z

Solving for variable 'z'.

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

Add '2z' to each side of the equation.
21 + 2z = 11 + -2z + 2z

Combine like terms: -2z + 2z = 0
21 + 2z = 11 + 0
21 + 2z = 11

Add '-21' to each side of the equation.
21 + -21 + 2z = 11 + -21

Combine like terms: 21 + -21 = 0
0 + 2z = 11 + -21
2z = 11 + -21

Combine like terms: 11 + -21 = -10
2z = -10

Divide each side by '2'.
z = -5

Simplifying
z = -5

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