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450+3x=x-405-x
We move all terms to the left:
450+3x-(x-405-x)=0
We add all the numbers together, and all the variables
3x+450-(-405)=0
We add all the numbers together, and all the variables
3x+855=0
We move all terms containing x to the left, all other terms to the right
3x=-855
x=-855/3
x=-285
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