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-8f=45-f
We move all terms to the left:
-8f-(45-f)=0
We add all the numbers together, and all the variables
-8f-(-1f+45)=0
We get rid of parentheses
-8f+1f-45=0
We add all the numbers together, and all the variables
-7f-45=0
We move all terms containing f to the left, all other terms to the right
-7f=45
f=45/-7
f=-6+3/7
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