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49=7+3f
We move all terms to the left:
49-(7+3f)=0
We add all the numbers together, and all the variables
-(3f+7)+49=0
We get rid of parentheses
-3f-7+49=0
We add all the numbers together, and all the variables
-3f+42=0
We move all terms containing f to the left, all other terms to the right
-3f=-42
f=-42/-3
f=+14
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