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-.85+12.1f=-3.57+15.5f
We move all terms to the left:
-.85+12.1f-(-3.57+15.5f)=0
We add all the numbers together, and all the variables
12.1f-(15.5f-3.57)-.85=0
We add all the numbers together, and all the variables
12.1f-(15.5f-3.57)-0.85=0
We get rid of parentheses
12.1f-15.5f+3.57-0.85=0
We add all the numbers together, and all the variables
-3.4f+2.72=0
We move all terms containing f to the left, all other terms to the right
-3.4f=-2.72
f=-2.72/-3.4
f=2.72/3.4
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