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3x=1800+6x
We move all terms to the left:
3x-(1800+6x)=0
We add all the numbers together, and all the variables
3x-(6x+1800)=0
We get rid of parentheses
3x-6x-1800=0
We add all the numbers together, and all the variables
-3x-1800=0
We move all terms containing x to the left, all other terms to the right
-3x=1800
x=1800/-3
x=-600
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