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-13+10f=12f+7
We move all terms to the left:
-13+10f-(12f+7)=0
We get rid of parentheses
10f-12f-7-13=0
We add all the numbers together, and all the variables
-2f-20=0
We move all terms containing f to the left, all other terms to the right
-2f=20
f=20/-2
f=-10
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