4+2+2=21-2z

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Solution for 4+2+2=21-2z equation:


Simplifying
4 + 2 + 2 = 21 + -2z

Combine like terms: 4 + 2 = 6
6 + 2 = 21 + -2z

Combine like terms: 6 + 2 = 8
8 = 21 + -2z

Solving
8 = 21 + -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.
8 + 2z = 21 + -2z + 2z

Combine like terms: -2z + 2z = 0
8 + 2z = 21 + 0
8 + 2z = 21

Add '-8' to each side of the equation.
8 + -8 + 2z = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 2z = 21 + -8
2z = 21 + -8

Combine like terms: 21 + -8 = 13
2z = 13

Divide each side by '2'.
z = 6.5

Simplifying
z = 6.5

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