43=15+f

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Solution for 43=15+f equation: 



43=15+f

We move all terms to the left:

43-(15+f)=0

We add all the numbers together, and all the variables

-(f+15)+43=0

We get rid of parentheses

-f-15+43=0

We add all the numbers together, and all the variables

-1f+28=0

We move all terms containing f to the left, all other terms to the right

-f=-28

f=-28/-1

f=+28

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