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6.8(f+3)=45f+45.7
We move all terms to the left:
6.8(f+3)-(45f+45.7)=0
We multiply parentheses
6.8f-(45f+45.7)+20.4=0
We get rid of parentheses
6.8f-45f-45.7+20.4=0
We add all the numbers together, and all the variables
-38.2f-25.3=0
We move all terms containing f to the left, all other terms to the right
-38.2f=25.3
f=25.3/-38.2
f=-19.461538461538/29.384615384615
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