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20*(h*2)+(h*2)=252
We move all terms to the left:
20*(h*2)+(h*2)-(252)=0
We add all the numbers together, and all the variables
20*(+h*2)+(+h*2)-252=0
We multiply parentheses
40h+(+h*2)-252=0
We get rid of parentheses
40h+h*2-252=0
Wy multiply elements
40h+2h-252=0
We add all the numbers together, and all the variables
42h-252=0
We move all terms containing h to the left, all other terms to the right
42h=252
h=252/42
h=6
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