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-19=1-8+F
We move all terms to the left:
-19-(1-8+F)=0
We add all the numbers together, and all the variables
-(F-7)-19=0
We get rid of parentheses
-F+7-19=0
We add all the numbers together, and all the variables
-1F-12=0
We move all terms containing F to the left, all other terms to the right
-F=12
F=12/-1
F=-12
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