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2f-10=10+4f
We move all terms to the left:
2f-10-(10+4f)=0
We add all the numbers together, and all the variables
2f-(4f+10)-10=0
We get rid of parentheses
2f-4f-10-10=0
We add all the numbers together, and all the variables
-2f-20=0
We move all terms containing f to the left, all other terms to the right
-2f=20
f=20/-2
f=-10
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