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6(-9x+12)=450
We move all terms to the left:
6(-9x+12)-(450)=0
We multiply parentheses
-54x+72-450=0
We add all the numbers together, and all the variables
-54x-378=0
We move all terms containing x to the left, all other terms to the right
-54x=378
x=378/-54
x=-7
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