21=7+2z

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Solution for 21=7+2z equation:


Simplifying
21 = 7 + 2z

Solving
21 = 7 + 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 = 7 + 2z + -2z

Combine like terms: 2z + -2z = 0
21 + -2z = 7 + 0
21 + -2z = 7

Add '-21' to each side of the equation.
21 + -21 + -2z = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -2z = 7 + -21
-2z = 7 + -21

Combine like terms: 7 + -21 = -14
-2z = -14

Divide each side by '-2'.
z = 7

Simplifying
z = 7

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