20f=30*4

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Solution for 20f=30*4 equation: 



20f=30*4

We move all terms to the left:

20f-(30*4)=0

We add all the numbers together, and all the variables

20f-120=0

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

20f=120

f=120/20

f=6

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