0.4=(10+x)/30

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Solution for 0.4=(10+x)/30 equation: 



0.4=(10+x)/30

We move all terms to the left:

0.4-((10+x)/30)=0

We add all the numbers together, and all the variables

-((x+10)/30)+0.4=0

We multiply all the terms by the denominator


-((x+10)+(0.4)*30)=0



We calculate terms in parentheses: -((x+10)+(0.4)*30), so:

(x+10)+(0.4)*30

We add all the numbers together, and all the variables

(x+10)+12

We get rid of parentheses

x+10+12

We add all the numbers together, and all the variables

x+22

Back to the equation:

-(x+22)



We get rid of parentheses

-x-22=0

We add all the numbers together, and all the variables

-1x-22=0

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

-x=22

x=22/-1

x=-22

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