(15)x+(21-12)=15x+9

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Solution for (15)x+(21-12)=15x+9 equation: 



(15)x+(21-12)=15x+9

We move all terms to the left:

(15)x+(21-12)-(15x+9)=0

We add all the numbers together, and all the variables

15x-(15x+9)+9=0

We get rid of parentheses

15x-15x-9+9=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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