12+x=0.4(30+x)

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Solution for 12+x=0.4(30+x) equation: 



12+x=0.4(30+x)

We move all terms to the left:

12+x-(0.4(30+x))=0

We add all the numbers together, and all the variables

x-(0.4(x+30))+12=0



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

0.4(x+30)

We multiply parentheses

0.4x+12

Back to the equation:

-(0.4x+12)



We get rid of parentheses

x-0.4x-12+12=0

We add all the numbers together, and all the variables

0.6x=0

x=0/0.6

x=0

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