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21+1.5=28-2h
We move all terms to the left:
21+1.5-(28-2h)=0
We add all the numbers together, and all the variables
-(-2h+28)+21+1.5=0
We add all the numbers together, and all the variables
-(-2h+28)+22.5=0
We get rid of parentheses
2h-28+22.5=0
We add all the numbers together, and all the variables
2h-5.5=0
We move all terms containing h to the left, all other terms to the right
2h=5.5
h=5.5/2
h=2+1/1.3333333333333
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