42=f-4

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Solution for 42=f-4 equation: 



42=f-4

We move all terms to the left:

42-(f-4)=0

We get rid of parentheses

-f+4+42=0

We add all the numbers together, and all the variables

-1f+46=0

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

-f=-46

f=-46/-1

f=+46

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