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7h-9=3 (7-h)
We simplify the equation to the form, which is simple to understand
7h-9=3(7-h)
Reorder the terms in parentheses
7h-9=+(+21-3h)
Remove unnecessary parentheses
+7h-9=+21-3h
We move all terms containing h to the left and all other terms to the right.
+7h+3h=+21+9
We simplify left and right side of the equation.
+10h=+30
We divide both sides of the equation by 10 to get h.
h=3
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