6h-9-12=4h-20

Solution for 6h-9-12=4h-20 equation:

Simplifying
6h + -9 + -12 = 4h + -20

Reorder the terms:
-9 + -12 + 6h = 4h + -20

Combine like terms: -9 + -12 = -21
-21 + 6h = 4h + -20

Reorder the terms:
-21 + 6h = -20 + 4h

Solving
-21 + 6h = -20 + 4h

Solving for variable 'h'.

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

Add '-4h' to each side of the equation.
-21 + 6h + -4h = -20 + 4h + -4h

Combine like terms: 6h + -4h = 2h
-21 + 2h = -20 + 4h + -4h

Combine like terms: 4h + -4h = 0
-21 + 2h = -20 + 0
-21 + 2h = -20

Add '21' to each side of the equation.
-21 + 21 + 2h = -20 + 21

Combine like terms: -21 + 21 = 0
0 + 2h = -20 + 21
2h = -20 + 21

Combine like terms: -20 + 21 = 1
2h = 1

Divide each side by '2'.
h = 0.5

Simplifying
h = 0.5