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20=625+10f
We move all terms to the left:
20-(625+10f)=0
We add all the numbers together, and all the variables
-(10f+625)+20=0
We get rid of parentheses
-10f-625+20=0
We add all the numbers together, and all the variables
-10f-605=0
We move all terms containing f to the left, all other terms to the right
-10f=605
f=605/-10
f=-60+1/2
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