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-18.6-1.4f=6.1f+12.9
We move all terms to the left:
-18.6-1.4f-(6.1f+12.9)=0
We get rid of parentheses
-1.4f-6.1f-12.9-18.6=0
We add all the numbers together, and all the variables
-7.5f-31.5=0
We move all terms containing f to the left, all other terms to the right
-7.5f=31.5
f=31.5/-7.5
f=-4+1/5
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