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15=51-4f
We move all terms to the left:
15-(51-4f)=0
We add all the numbers together, and all the variables
-(-4f+51)+15=0
We get rid of parentheses
4f-51+15=0
We add all the numbers together, and all the variables
4f-36=0
We move all terms containing f to the left, all other terms to the right
4f=36
f=36/4
f=9
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