-100+-4f=4*30

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Solution for -100+-4f=4*30 equation: 



-100+-4f=4*30

We move all terms to the left:

-100+-4f-(4*30)=0

We add all the numbers together, and all the variables

-4f-100+-120=0

We add all the numbers together, and all the variables

-4f-220=0

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

-4f=220

f=220/-4

f=-55

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