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-2f+9=f-6+2f
We move all terms to the left:
-2f+9-(f-6+2f)=0
We add all the numbers together, and all the variables
-2f-(3f-6)+9=0
We get rid of parentheses
-2f-3f+6+9=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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