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+4=-F
We move all terms to the left:
+4-(-F)=0
We add all the numbers together, and all the variables
-(-1F)+4=0
We get rid of parentheses
1F+4=0
We add all the numbers together, and all the variables
F+4=0
We move all terms containing F to the left, all other terms to the right
F=-4
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