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7.5f-0.83=4.39+8.4f
We move all terms to the left:
7.5f-0.83-(4.39+8.4f)=0
We add all the numbers together, and all the variables
7.5f-(8.4f+4.39)-0.83=0
We get rid of parentheses
7.5f-8.4f-4.39-0.83=0
We add all the numbers together, and all the variables
-0.9f-5.22=0
We move all terms containing f to the left, all other terms to the right
-0.9f=5.22
f=5.22/-0.9
f=-5+0.72/0.9
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