x(x)+3=15

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



x(x)+3=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

xx-12=0

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

xx=12

x=12/1

x=12

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