3f+6=90-4f

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Solution for 3f+6=90-4f equation: 



3f+6=90-4f

We move all terms to the left:

3f+6-(90-4f)=0

We add all the numbers together, and all the variables

3f-(-4f+90)+6=0

We get rid of parentheses

3f+4f-90+6=0

We add all the numbers together, and all the variables

7f-84=0

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

7f=84

f=84/7

f=12

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