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=-8.6+-12.9F-1+4.3F
We move all terms to the left:
-(-8.6+-12.9F-1+4.3F)=0
We add all the numbers together, and all the variables
-(-8.6F-9.6)=0
We get rid of parentheses
8.6F+9.6=0
We move all terms containing F to the left, all other terms to the right
8.6F=-9.6
F=-9.6/8.6
F=-1+1/8.6
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