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-5-7-2f=-1f-2(f+6)
We move all terms to the left:
-5-7-2f-(-1f-2(f+6))=0
We add all the numbers together, and all the variables
-2f-(-1f-2(f+6))-12=0
We calculate terms in parentheses: -(-1f-2(f+6)), so:We get rid of parentheses
-1f-2(f+6)
We multiply parentheses
-1f-2f-12
We add all the numbers together, and all the variables
-3f-12
Back to the equation:
-(-3f-12)
-2f+3f+12-12=0
We add all the numbers together, and all the variables
f=0
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