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20f=-6+18f
We move all terms to the left:
20f-(-6+18f)=0
We add all the numbers together, and all the variables
20f-(18f-6)=0
We get rid of parentheses
20f-18f+6=0
We add all the numbers together, and all the variables
2f+6=0
We move all terms containing f to the left, all other terms to the right
2f=-6
f=-6/2
f=-3
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