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12(9+3)-3x=x
We move all terms to the left:
12(9+3)-3x-(x)=0
We add all the numbers together, and all the variables
-3x-x+1212=0
We add all the numbers together, and all the variables
-4x+1212=0
We move all terms containing x to the left, all other terms to the right
-4x=-1212
x=-1212/-4
x=+303
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