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1300000=5000x*0.9-300x
We move all terms to the left:
1300000-(5000x*0.9-300x)=0
We add all the numbers together, and all the variables
-(-300x+5000x*0.9)+1300000=0
We get rid of parentheses
300x-5000x*0.9+1300000=0
Wy multiply elements
300x-4500x+1300000=0
We add all the numbers together, and all the variables
-4200x+1300000=0
We move all terms containing x to the left, all other terms to the right
-4200x=-1300000
x=-1300000/-4200
x=309+11/21
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