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-2.2f=-28.6
We move all terms to the left:
-2.2f-(-28.6)=0
We add all the numbers together, and all the variables
-2.2f+28.6=0
We move all terms containing f to the left, all other terms to the right
-2.2f=-28.6
f=-28.6/-2.2
f=+13
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