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1800=1.5x+1.5x+x
We move all terms to the left:
1800-(1.5x+1.5x+x)=0
We add all the numbers together, and all the variables
-(+4x)+1800=0
We get rid of parentheses
-4x+1800=0
We move all terms containing x to the left, all other terms to the right
-4x=-1800
x=-1800/-4
x=+450
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