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x=90x+1800
We move all terms to the left:
x-(90x+1800)=0
We get rid of parentheses
x-90x-1800=0
We add all the numbers together, and all the variables
-89x-1800=0
We move all terms containing x to the left, all other terms to the right
-89x=1800
x=1800/-89
x=-20+20/89
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