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h+3h-4=20
We simplify the equation to the form, which is simple to understand
h+3h-4=20
We move all terms containing h to the left and all other terms to the right.
+1h+3h=+20+4
We simplify left and right side of the equation.
+4h=+24
We divide both sides of the equation by 4 to get h.
h=6
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