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20=6(5-4f)
We move all terms to the left:
20-(6(5-4f))=0
We add all the numbers together, and all the variables
-(6(-4f+5))+20=0
We calculate terms in parentheses: -(6(-4f+5)), so:We get rid of parentheses
6(-4f+5)
We multiply parentheses
-24f+30
Back to the equation:
-(-24f+30)
24f-30+20=0
We add all the numbers together, and all the variables
24f-10=0
We move all terms containing f to the left, all other terms to the right
24f=10
f=10/24
f=5/12
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