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h-(-21)=80
We simplify the equation to the form, which is simple to understand
h-(-21)=80
Remove unnecessary parentheses
h+21=80
We move all terms containing h to the left and all other terms to the right.
+1h=+80-21
We simplify left and right side of the equation.
+1h=+59
We divide both sides of the equation by 1 to get h.
h=59
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