84=21+7f

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Solution for 84=21+7f equation:



84=21+7f
We move all terms to the left:
84-(21+7f)=0
We add all the numbers together, and all the variables
-(7f+21)+84=0
We get rid of parentheses
-7f-21+84=0
We add all the numbers together, and all the variables
-7f+63=0
We move all terms containing f to the left, all other terms to the right
-7f=-63
f=-63/-7
f=+9

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