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-7f=56-f
We move all terms to the left:
-7f-(56-f)=0
We add all the numbers together, and all the variables
-7f-(-1f+56)=0
We get rid of parentheses
-7f+1f-56=0
We add all the numbers together, and all the variables
-6f-56=0
We move all terms containing f to the left, all other terms to the right
-6f=56
f=56/-6
f=-9+1/3
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