15x+3=3x-9

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Solution for 15x+3=3x-9 equation: 



15x+3=3x-9

We move all terms to the left:

15x+3-(3x-9)=0

We get rid of parentheses

15x-3x+9+3=0

We add all the numbers together, and all the variables

12x+12=0

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

12x=-12

x=-12/12

x=-1

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