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-4f+10-8f=-8f-10
We move all terms to the left:
-4f+10-8f-(-8f-10)=0
We add all the numbers together, and all the variables
-12f-(-8f-10)+10=0
We get rid of parentheses
-12f+8f+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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