2*(9-h)=20

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Solution for 2*(9-h)=20 equation: 


Simplifying
2(9 + -1h) = 20
(9 * 2 + -1h * 2) = 20
(18 + -2h) = 20

Solving
18 + -2h = 20

Solving for variable 'h'.

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

Add '-18' to each side of the equation.
18 + -18 + -2h = 20 + -18

Combine like terms: 18 + -18 = 0
0 + -2h = 20 + -18
-2h = 20 + -18

Combine like terms: 20 + -18 = 2
-2h = 2

Divide each side by '-2'.
h = -1

Simplifying
h = -1

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