3x(3x)+12x=15

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Solution for 3x(3x)+12x=15 equation: 



3x(3x)+12x=15

We move all terms to the left:

3x(3x)+12x-(15)=0

We add all the numbers together, and all the variables

12x+3x3x-15=0

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

12x+3x3x=15

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