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-8f+10-6f=-10f-20
We move all terms to the left:
-8f+10-6f-(-10f-20)=0
We add all the numbers together, and all the variables
-14f-(-10f-20)+10=0
We get rid of parentheses
-14f+10f+20+10=0
We add all the numbers together, and all the variables
-4f+30=0
We move all terms containing f to the left, all other terms to the right
-4f=-30
f=-30/-4
f=7+1/2
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