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15=6-3f
We move all terms to the left:
15-(6-3f)=0
We add all the numbers together, and all the variables
-(-3f+6)+15=0
We get rid of parentheses
3f-6+15=0
We add all the numbers together, and all the variables
3f+9=0
We move all terms containing f to the left, all other terms to the right
3f=-9
f=-9/3
f=-3
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