21=6-(2.3x)-(2.7x)

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Solution for 21=6-(2.3x)-(2.7x) equation: 



21=6-(2.3x)-(2.7x)

We move all terms to the left:

21-(6-(2.3x)-(2.7x))=0

We add all the numbers together, and all the variables

-(6-(+2.3x)-(+2.7x))+21=0



We calculate terms in parentheses: -(6-(+2.3x)-(+2.7x)), so:

6-(+2.3x)-(+2.7x)

determiningTheFunctionDomain
-(+2.3x)-(+2.7x)+6

We get rid of parentheses

-2.3x-2.7x+6

We add all the numbers together, and all the variables

-5x+6

Back to the equation:

-(-5x+6)



We get rid of parentheses

5x-6+21=0

We add all the numbers together, and all the variables

5x+15=0

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

5x=-15

x=-15/5

x=-3

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