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-15f+-20=18+8f
We move all terms to the left:
-15f+-20-(18+8f)=0
We add all the numbers together, and all the variables
-15f-(8f+18)-20+=0
We add all the numbers together, and all the variables
-15f-(8f+18)=0
We get rid of parentheses
-15f-8f-18=0
We add all the numbers together, and all the variables
-23f-18=0
We move all terms containing f to the left, all other terms to the right
-23f=18
f=18/-23
f=-18/23
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