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1800=x+1.25x
We move all terms to the left:
1800-(x+1.25x)=0
We add all the numbers together, and all the variables
-(+2.25x)+1800=0
We get rid of parentheses
-2.25x+1800=0
We move all terms containing x to the left, all other terms to the right
-2.25x=-1800
x=-1800/-2.25
x=+800
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