7(3-x)+21=7(6-x)

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Solution for 7(3-x)+21=7(6-x) equation: 



7(3-x)+21=7(6-x)

We move all terms to the left:

7(3-x)+21-(7(6-x))=0

We add all the numbers together, and all the variables

7(-1x+3)-(7(-1x+6))+21=0

We multiply parentheses

-7x-(7(-1x+6))+21+21=0



We calculate terms in parentheses: -(7(-1x+6)), so:

7(-1x+6)

We multiply parentheses

-7x+42

Back to the equation:

-(-7x+42)



We add all the numbers together, and all the variables

-7x-(-7x+42)+42=0

We get rid of parentheses

-7x+7x-42+42=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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