0=21+7(12-x)

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Solution for 0=21+7(12-x) equation: 



0=21+7(12-x)

We move all terms to the left:

0-(21+7(12-x))=0

We add all the numbers together, and all the variables

-(21+7(-1x+12))+0=0

We add all the numbers together, and all the variables

-(21+7(-1x+12))=0



We calculate terms in parentheses: -(21+7(-1x+12)), so:

21+7(-1x+12)

determiningTheFunctionDomain
7(-1x+12)+21

We multiply parentheses

-7x+84+21

We add all the numbers together, and all the variables

-7x+105

Back to the equation:

-(-7x+105)



We get rid of parentheses

7x-105=0

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

7x=105

x=105/7

x=15

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