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