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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