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13-18f=-2-13f
We move all terms to the left:
13-18f-(-2-13f)=0
We add all the numbers together, and all the variables
-18f-(-13f-2)+13=0
We get rid of parentheses
-18f+13f+2+13=0
We add all the numbers together, and all the variables
-5f+15=0
We move all terms containing f to the left, all other terms to the right
-5f=-15
f=-15/-5
f=+3
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