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20-0.9h=2
We simplify the equation to the form, which is simple to understand
20-0.9h=2
We move all terms containing h to the left and all other terms to the right.
-0.9h=+2-20
We simplify left and right side of the equation.
-0.9h=-18
We divide both sides of the equation by -0.9 to get h.
h=20
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