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2(f+3)=-1
We move all terms to the left:
2(f+3)-(-1)=0
We add all the numbers together, and all the variables
2(f+3)+1=0
We multiply parentheses
2f+6+1=0
We add all the numbers together, and all the variables
2f+7=0
We move all terms containing f to the left, all other terms to the right
2f=-7
f=-7/2
f=-3+1/2
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