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X-25=12+9+3X
We move all terms to the left:
X-25-(12+9+3X)=0
We add all the numbers together, and all the variables
X-(3X+21)-25=0
We get rid of parentheses
X-3X-21-25=0
We add all the numbers together, and all the variables
-2X-46=0
We move all terms containing X to the left, all other terms to the right
-2X=46
X=46/-2
X=-23
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