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-20+4f+19=19+6f
We move all terms to the left:
-20+4f+19-(19+6f)=0
We add all the numbers together, and all the variables
4f-(6f+19)-20+19=0
We add all the numbers together, and all the variables
4f-(6f+19)-1=0
We get rid of parentheses
4f-6f-19-1=0
We add all the numbers together, and all the variables
-2f-20=0
We move all terms containing f to the left, all other terms to the right
-2f=20
f=20/-2
f=-10
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