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2-5f=2-4f-15
We move all terms to the left:
2-5f-(2-4f-15)=0
We add all the numbers together, and all the variables
-5f-(-4f-13)+2=0
We get rid of parentheses
-5f+4f+13+2=0
We add all the numbers together, and all the variables
-1f+15=0
We move all terms containing f to the left, all other terms to the right
-f=-15
f=-15/-1
f=+15
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