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10f+4=-6+9f
We move all terms to the left:
10f+4-(-6+9f)=0
We add all the numbers together, and all the variables
10f-(9f-6)+4=0
We get rid of parentheses
10f-9f+6+4=0
We add all the numbers together, and all the variables
f+10=0
We move all terms containing f to the left, all other terms to the right
f=-10
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