20-9h=-7h+8h-20

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Solution for 20-9h=-7h+8h-20 equation: 


Simplifying
20 + -9h = -7h + 8h + -20

Reorder the terms:
20 + -9h = -20 + -7h + 8h

Combine like terms: -7h + 8h = 1h
20 + -9h = -20 + 1h

Solving
20 + -9h = -20 + 1h

Solving for variable 'h'.

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

Add '-1h' to each side of the equation.
20 + -9h + -1h = -20 + 1h + -1h

Combine like terms: -9h + -1h = -10h
20 + -10h = -20 + 1h + -1h

Combine like terms: 1h + -1h = 0
20 + -10h = -20 + 0
20 + -10h = -20

Add '-20' to each side of the equation.
20 + -20 + -10h = -20 + -20

Combine like terms: 20 + -20 = 0
0 + -10h = -20 + -20
-10h = -20 + -20

Combine like terms: -20 + -20 = -40
-10h = -40

Divide each side by '-10'.
h = 4

Simplifying
h = 4

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