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-3.09+6.4f=7.47-8f+15.6f
We move all terms to the left:
-3.09+6.4f-(7.47-8f+15.6f)=0
We add all the numbers together, and all the variables
6.4f-(7.6f+7.47)-3.09=0
We get rid of parentheses
6.4f-7.6f-7.47-3.09=0
We add all the numbers together, and all the variables
-1.2f-10.56=0
We move all terms containing f to the left, all other terms to the right
-1.2f=10.56
f=10.56/-1.2
f=-8+0.96/1.2
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