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-10-10+4f=7f+10
We move all terms to the left:
-10-10+4f-(7f+10)=0
We add all the numbers together, and all the variables
4f-(7f+10)-20=0
We get rid of parentheses
4f-7f-10-20=0
We add all the numbers together, and all the variables
-3f-30=0
We move all terms containing f to the left, all other terms to the right
-3f=30
f=30/-3
f=-10
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