21=3x+15

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Solution for 21=3x+15 equation: 



21=3x+15

We move all terms to the left:

21-(3x+15)=0

We get rid of parentheses

-3x-15+21=0

We add all the numbers together, and all the variables

-3x+6=0

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

-3x=-6

x=-6/-3

x=+2

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