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3f=10+4f
We move all terms to the left:
3f-(10+4f)=0
We add all the numbers together, and all the variables
3f-(4f+10)=0
We get rid of parentheses
3f-4f-10=0
We add all the numbers together, and all the variables
-1f-10=0
We move all terms containing f to the left, all other terms to the right
-f=10
f=10/-1
f=-10
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