6(x-3)+3x=21-3(x+9)

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Solution for 6(x-3)+3x=21-3(x+9) equation: 



6(x-3)+3x=21-3(x+9)

We move all terms to the left:

6(x-3)+3x-(21-3(x+9))=0

We add all the numbers together, and all the variables

3x+6(x-3)-(21-3(x+9))=0

We multiply parentheses

3x+6x-(21-3(x+9))-18=0



We calculate terms in parentheses: -(21-3(x+9)), so:

21-3(x+9)

determiningTheFunctionDomain
-3(x+9)+21

We multiply parentheses

-3x-27+21

We add all the numbers together, and all the variables

-3x-6

Back to the equation:

-(-3x-6)



We add all the numbers together, and all the variables

9x-(-3x-6)-18=0

We get rid of parentheses

9x+3x+6-18=0

We add all the numbers together, and all the variables

12x-12=0

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

12x=12

x=12/12

x=1

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