21=2n+3

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Solution for 21=2n+3 equation:



21=2n+3
We move all terms to the left:
21-(2n+3)=0
We get rid of parentheses
-2n-3+21=0
We add all the numbers together, and all the variables
-2n+18=0
We move all terms containing n to the left, all other terms to the right
-2n=-18
n=-18/-2
n=+9

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