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-5-8=5-3f
We move all terms to the left:
-5-8-(5-3f)=0
We add all the numbers together, and all the variables
-(-3f+5)-5-8=0
We add all the numbers together, and all the variables
-(-3f+5)-13=0
We get rid of parentheses
3f-5-13=0
We add all the numbers together, and all the variables
3f-18=0
We move all terms containing f to the left, all other terms to the right
3f=18
f=18/3
f=6
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