20=4(f+1)+4

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Solution for 20=4(f+1)+4 equation: 



20=4(f+1)+4

We move all terms to the left:

20-(4(f+1)+4)=0



We calculate terms in parentheses: -(4(f+1)+4), so:

4(f+1)+4

We multiply parentheses

4f+4+4

We add all the numbers together, and all the variables

4f+8

Back to the equation:

-(4f+8)



We get rid of parentheses

-4f-8+20=0

We add all the numbers together, and all the variables

-4f+12=0

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

-4f=-12

f=-12/-4

f=+3

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