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130=80+f
We move all terms to the left:
130-(80+f)=0
We add all the numbers together, and all the variables
-(f+80)+130=0
We get rid of parentheses
-f-80+130=0
We add all the numbers together, and all the variables
-1f+50=0
We move all terms containing f to the left, all other terms to the right
-f=-50
f=-50/-1
f=+50
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