18+a/3=21

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Solution for 18+a/3=21 equation: 



18+a/3=21

We move all terms to the left:

18+a/3-(21)=0

We add all the numbers together, and all the variables

a/3-3=0

We multiply all the terms by the denominator


a-3*3=0

We add all the numbers together, and all the variables

a-9=0

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

a=9

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