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13-10f=-15-14f
We move all terms to the left:
13-10f-(-15-14f)=0
We add all the numbers together, and all the variables
-10f-(-14f-15)+13=0
We get rid of parentheses
-10f+14f+15+13=0
We add all the numbers together, and all the variables
4f+28=0
We move all terms containing f to the left, all other terms to the right
4f=-28
f=-28/4
f=-7
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