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(f+30)+72=180
We move all terms to the left:
(f+30)+72-(180)=0
We add all the numbers together, and all the variables
(f+30)-108=0
We get rid of parentheses
f+30-108=0
We add all the numbers together, and all the variables
f-78=0
We move all terms containing f to the left, all other terms to the right
f=78
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