21x=72-3x

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Solution for 21x=72-3x equation: 



21x=72-3x

We move all terms to the left:

21x-(72-3x)=0

We add all the numbers together, and all the variables

21x-(-3x+72)=0

We get rid of parentheses

21x+3x-72=0

We add all the numbers together, and all the variables

24x-72=0

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

24x=72

x=72/24

x=3

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