3.9(-7+x)=0.9(9x-21)

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Solution for 3.9(-7+x)=0.9(9x-21) equation: 



3.9(-7+x)=0.9(9x-21)

We move all terms to the left:

3.9(-7+x)-(0.9(9x-21))=0

We add all the numbers together, and all the variables

3.9(x-7)-(0.9(9x-21))=0

We multiply parentheses

3.9x-(0.9(9x-21))-27.3=0



We calculate terms in parentheses: -(0.9(9x-21)), so:

0.9(9x-21)

We multiply parentheses

8.1x-18.9

Back to the equation:

-(8.1x-18.9)



We get rid of parentheses

3.9x-8.1x+18.9-27.3=0

We add all the numbers together, and all the variables

-4.2x-8.4=0

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

-4.2x=8.4

x=8.4/-4.2

x=-2

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