21=9-2h

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Solution for 21=9-2h equation:


Simplifying
21 = 9 + -2h

Solving
21 = 9 + -2h

Solving for variable 'h'.

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

Add '2h' to each side of the equation.
21 + 2h = 9 + -2h + 2h

Combine like terms: -2h + 2h = 0
21 + 2h = 9 + 0
21 + 2h = 9

Add '-21' to each side of the equation.
21 + -21 + 2h = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 2h = 9 + -21
2h = 9 + -21

Combine like terms: 9 + -21 = -12
2h = -12

Divide each side by '2'.
h = -6

Simplifying
h = -6

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