40=10f+30

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Solution for 40=10f+30 equation: 



40=10f+30

We move all terms to the left:

40-(10f+30)=0

We get rid of parentheses

-10f-30+40=0

We add all the numbers together, and all the variables

-10f+10=0

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

-10f=-10

f=-10/-10

f=1

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