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(-4)=-F+8
We move all terms to the left:
(-4)-(-F+8)=0
We add all the numbers together, and all the variables
-(-1F+8)+(-4)=0
We add all the numbers together, and all the variables
-(-1F+8)-4=0
We get rid of parentheses
1F-8-4=0
We add all the numbers together, and all the variables
F-12=0
We move all terms containing F to the left, all other terms to the right
F=12
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