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10000-x*2=4000
We move all terms to the left:
10000-x*2-(4000)=0
We add all the numbers together, and all the variables
-x*2+6000=0
Wy multiply elements
-2x+6000=0
We move all terms containing x to the left, all other terms to the right
-2x=-6000
x=-6000/-2
x=+3000
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