19-20f=-9f+4-12f

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Solution for 19-20f=-9f+4-12f equation: 



19-20f=-9f+4-12f

We move all terms to the left:

19-20f-(-9f+4-12f)=0

We add all the numbers together, and all the variables

-20f-(-21f+4)+19=0

We get rid of parentheses

-20f+21f-4+19=0

We add all the numbers together, and all the variables

f+15=0

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

f=-15

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