13=21-4z

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Solution for 13=21-4z equation:


Simplifying
13 = 21 + -4z

Solving
13 = 21 + -4z

Solving for variable 'z'.

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

Add '4z' to each side of the equation.
13 + 4z = 21 + -4z + 4z

Combine like terms: -4z + 4z = 0
13 + 4z = 21 + 0
13 + 4z = 21

Add '-13' to each side of the equation.
13 + -13 + 4z = 21 + -13

Combine like terms: 13 + -13 = 0
0 + 4z = 21 + -13
4z = 21 + -13

Combine like terms: 21 + -13 = 8
4z = 8

Divide each side by '4'.
z = 2

Simplifying
z = 2

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