12=21-3h

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Solution for 12=21-3h equation:


Simplifying
12 = 21 + -3h

Solving
12 = 21 + -3h

Solving for variable 'h'.

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

Add '3h' to each side of the equation.
12 + 3h = 21 + -3h + 3h

Combine like terms: -3h + 3h = 0
12 + 3h = 21 + 0
12 + 3h = 21

Add '-12' to each side of the equation.
12 + -12 + 3h = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3h = 21 + -12
3h = 21 + -12

Combine like terms: 21 + -12 = 9
3h = 9

Divide each side by '3'.
h = 3

Simplifying
h = 3

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