(18+24+x)/3=21

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Solution for (18+24+x)/3=21 equation: 



(18+24+x)/3=21

We move all terms to the left:

(18+24+x)/3-(21)=0

We add all the numbers together, and all the variables

(x+42)/3-21=0

We multiply all the terms by the denominator


(x+42)-21*3=0

We add all the numbers together, and all the variables

(x+42)-63=0

We get rid of parentheses

x+42-63=0

We add all the numbers together, and all the variables

x-21=0

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

x=21

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