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5+6f=-15f-16+18f
We move all terms to the left:
5+6f-(-15f-16+18f)=0
We add all the numbers together, and all the variables
6f-(3f-16)+5=0
We get rid of parentheses
6f-3f+16+5=0
We add all the numbers together, and all the variables
3f+21=0
We move all terms containing f to the left, all other terms to the right
3f=-21
f=-21/3
f=-7
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