21=15x-3x

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Solution for 21=15x-3x equation: 



21=15x-3x

We move all terms to the left:

21-(15x-3x)=0

We add all the numbers together, and all the variables

-(+12x)+21=0

We get rid of parentheses

-12x+21=0

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

-12x=-21

x=-21/-12

x=1+3/4

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