D/100=7x/4x

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Solution for D/100=7x/4x equation: 



/100=7D/4D

We move all terms to the left:

/100-(7D/4D)=0



Domain of the equation: 4D)!=0

D!=0/1

D!=0

D∈R



We add all the numbers together, and all the variables

-(+7D/4D)+/100=0

We get rid of parentheses

-7D/4D+/100=0

We calculate fractions


(-700D)/400D+(*4D)/400D=0

We add all the numbers together, and all the variables

(-700D)/400D+(+*4D)/400D=0

We multiply all the terms by the denominator


(-700D)+(+*4D)=0

We get rid of parentheses

-700D+*4D=0

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