4.20=(.75*4.20)+u

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Solution for 4.20=(.75*4.20)+u equation: 



4.20=(.75*4.20)+u

We move all terms to the left:

4.20-((.75*4.20)+u)=0

We add all the numbers together, and all the variables

-((3.15)+u)+4.20=0

We add all the numbers together, and all the variables

-((3.15)+u)+4.2=0



We calculate terms in parentheses: -((3.15)+u), so:

(3.15)+u

determiningTheFunctionDomain
u+(3.15)

We add all the numbers together, and all the variables

u+3.15

Back to the equation:

-(u+3.15)



We get rid of parentheses

-u-3.15+4.2=0

We add all the numbers together, and all the variables

-1u+1.05=0

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

-u=-1.05

u=-1.05/-1

u=1+0.05/1

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