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x-x*0.13=30000
We move all terms to the left:
x-x*0.13-(30000)=0
Wy multiply elements
x-0.13x-30000=0
We add all the numbers together, and all the variables
0.87x-30000=0
We move all terms containing x to the left, all other terms to the right
0.87x=30000
x=30000/0.87
x=34482+0.65999999999985/0.87
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