7-(x+1)=9-(2x+3)=21

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Solution for 7-(x+1)=9-(2x+3)=21 equation: 



7-(x+1)=9-(2x+3)=21

We move all terms to the left:

7-(x+1)-(9-(2x+3))=0

We get rid of parentheses

-x-(9-(2x+3))-1+7=0



We calculate terms in parentheses: -(9-(2x+3)), so:

9-(2x+3)

determiningTheFunctionDomain
-(2x+3)+9

We get rid of parentheses

-2x-3+9

We add all the numbers together, and all the variables

-2x+6

Back to the equation:

-(-2x+6)



We add all the numbers together, and all the variables

-1x-(-2x+6)+6=0

We get rid of parentheses

-1x+2x-6+6=0

We add all the numbers together, and all the variables

x=0

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