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f-(-19)=11f+23-20f
We move all terms to the left:
f-(-19)-(11f+23-20f)=0
We add all the numbers together, and all the variables
f-(-9f+23)-(-19)=0
We add all the numbers together, and all the variables
f-(-9f+23)+19=0
We get rid of parentheses
f+9f-23+19=0
We add all the numbers together, and all the variables
10f-4=0
We move all terms containing f to the left, all other terms to the right
10f=4
f=4/10
f=2/5
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