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105=3(3+f)
We move all terms to the left:
105-(3(3+f))=0
We add all the numbers together, and all the variables
-(3(f+3))+105=0
We calculate terms in parentheses: -(3(f+3)), so:We get rid of parentheses
3(f+3)
We multiply parentheses
3f+9
Back to the equation:
-(3f+9)
-3f-9+105=0
We add all the numbers together, and all the variables
-3f+96=0
We move all terms containing f to the left, all other terms to the right
-3f=-96
f=-96/-3
f=+32
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