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-10-3f=10-7f
We move all terms to the left:
-10-3f-(10-7f)=0
We add all the numbers together, and all the variables
-3f-(-7f+10)-10=0
We get rid of parentheses
-3f+7f-10-10=0
We add all the numbers together, and all the variables
4f-20=0
We move all terms containing f to the left, all other terms to the right
4f=20
f=20/4
f=5
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