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7-4f=12-5f
We move all terms to the left:
7-4f-(12-5f)=0
We add all the numbers together, and all the variables
-4f-(-5f+12)+7=0
We get rid of parentheses
-4f+5f-12+7=0
We add all the numbers together, and all the variables
f-5=0
We move all terms containing f to the left, all other terms to the right
f=5
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