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7f+3(3+f)=-28+2f-6
We move all terms to the left:
7f+3(3+f)-(-28+2f-6)=0
We add all the numbers together, and all the variables
7f+3(f+3)-(2f-34)=0
We multiply parentheses
7f+3f-(2f-34)+9=0
We get rid of parentheses
7f+3f-2f+34+9=0
We add all the numbers together, and all the variables
8f+43=0
We move all terms containing f to the left, all other terms to the right
8f=-43
f=-43/8
f=-5+3/8
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