15-3-x=12-3

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Solution for 15-3-x=12-3 equation: 



15-3-x=12-3

We move all terms to the left:

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

We add all the numbers together, and all the variables

-x+15-3-9=0

We add all the numbers together, and all the variables

-1x+3=0

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

-x=-3

x=-3/-1

x=+3

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