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

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



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

We move all terms to the left:

7x-9-21x-(3-(21+2x))=0

We add all the numbers together, and all the variables

7x-21x-(3-(2x+21))-9=0

We add all the numbers together, and all the variables

-14x-(3-(2x+21))-9=0



We calculate terms in parentheses: -(3-(2x+21)), so:

3-(2x+21)

determiningTheFunctionDomain
-(2x+21)+3

We get rid of parentheses

-2x-21+3

We add all the numbers together, and all the variables

-2x-18

Back to the equation:

-(-2x-18)



We get rid of parentheses

-14x+2x+18-9=0

We add all the numbers together, and all the variables

-12x+9=0

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

-12x=-9

x=-9/-12

x=3/4

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