8f+21=-7f-19

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Solution for 8f+21=-7f-19 equation: 



8f+21=-7f-19

We move all terms to the left:

8f+21-(-7f-19)=0

We get rid of parentheses

8f+7f+19+21=0

We add all the numbers together, and all the variables

15f+40=0

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

15f=-40

f=-40/15

f=-2+2/3

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