x=12-15

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Solution for x=12-15 equation: 



x=12-15

We move all terms to the left:

x-(12-15)=0

We add all the numbers together, and all the variables

x-(-3)=0

We add all the numbers together, and all the variables

x+3=0

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

x=-3

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