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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