40=2(f-78)

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Solution for 40=2(f-78) equation: 



40=2(f-78)

We move all terms to the left:

40-(2(f-78))=0



We calculate terms in parentheses: -(2(f-78)), so:

2(f-78)

We multiply parentheses

2f-156

Back to the equation:

-(2f-156)



We get rid of parentheses

-2f+156+40=0

We add all the numbers together, and all the variables

-2f+196=0

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

-2f=-196

f=-196/-2

f=+98

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