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

18x-72=0

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

18x=72

x=72/18

x=4

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