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8f-10f=21-5f
We move all terms to the left:
8f-10f-(21-5f)=0
We add all the numbers together, and all the variables
8f-10f-(-5f+21)=0
We add all the numbers together, and all the variables
-2f-(-5f+21)=0
We get rid of parentheses
-2f+5f-21=0
We add all the numbers together, and all the variables
3f-21=0
We move all terms containing f to the left, all other terms to the right
3f=21
f=21/3
f=7
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