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9-7f=-9-5
We move all terms to the left:
9-7f-(-9-5)=0
We add all the numbers together, and all the variables
-7f+9-(-14)=0
We add all the numbers together, and all the variables
-7f+23=0
We move all terms containing f to the left, all other terms to the right
-7f=-23
f=-23/-7
f=3+2/7
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