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123(123x-321x)+456(456x+654x)=69
We move all terms to the left:
123(123x-321x)+456(456x+654x)-(69)=0
We add all the numbers together, and all the variables
123(-198x)+456(+1110x)-69=0
We multiply parentheses
-24354x+506160x-69=0
We add all the numbers together, and all the variables
481806x-69=0
We move all terms containing x to the left, all other terms to the right
481806x=69
x=69/481806
x=23/160602
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