24-21=3(24-x)

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Solution for 24-21=3(24-x) equation: 



24-21=3(24-x)

We move all terms to the left:

24-21-(3(24-x))=0

We add all the numbers together, and all the variables

-(3(-1x+24))+24-21=0

We add all the numbers together, and all the variables

-(3(-1x+24))+3=0



We calculate terms in parentheses: -(3(-1x+24)), so:

3(-1x+24)

We multiply parentheses

-3x+72

Back to the equation:

-(-3x+72)



We get rid of parentheses

3x-72+3=0

We add all the numbers together, and all the variables

3x-69=0

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

3x=69

x=69/3

x=23

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