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-12.15-2.9f=6.57+4.9f
We move all terms to the left:
-12.15-2.9f-(6.57+4.9f)=0
We add all the numbers together, and all the variables
-2.9f-(4.9f+6.57)-12.15=0
We get rid of parentheses
-2.9f-4.9f-6.57-12.15=0
We add all the numbers together, and all the variables
-7.8f-18.72=0
We move all terms containing f to the left, all other terms to the right
-7.8f=18.72
f=18.72/-7.8
f=-2+2.78571428571/6.96428571429
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