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8+3f=-1+f-3
We move all terms to the left:
8+3f-(-1+f-3)=0
We add all the numbers together, and all the variables
3f-(f-4)+8=0
We get rid of parentheses
3f-f+4+8=0
We add all the numbers together, and all the variables
2f+12=0
We move all terms containing f to the left, all other terms to the right
2f=-12
f=-12/2
f=-6
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