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-18f=10-13f
We move all terms to the left:
-18f-(10-13f)=0
We add all the numbers together, and all the variables
-18f-(-13f+10)=0
We get rid of parentheses
-18f+13f-10=0
We add all the numbers together, and all the variables
-5f-10=0
We move all terms containing f to the left, all other terms to the right
-5f=10
f=10/-5
f=-2
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