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123(123x-321x)+(456x+654)=69
We move all terms to the left:
123(123x-321x)+(456x+654)-(69)=0
We add all the numbers together, and all the variables
123(-198x)+(456x+654)-69=0
We multiply parentheses
-24354x+(456x+654)-69=0
We get rid of parentheses
-24354x+456x+654-69=0
We add all the numbers together, and all the variables
-23898x+585=0
We move all terms containing x to the left, all other terms to the right
-23898x=-585
x=-585/-23898
x=195/7966
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