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0.9=x/20000
We move all terms to the left:
0.9-(x/20000)=0
We add all the numbers together, and all the variables
-(+x/20000)+0.9=0
We get rid of parentheses
-x/20000+0.9=0
We multiply all the terms by the denominator
-x+(0.9)*20000=0
We add all the numbers together, and all the variables
-1x+18000=0
We move all terms containing x to the left, all other terms to the right
-x=-18000
x=-18000/-1
x=+18000
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