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x*0.9=30000
We move all terms to the left:
x*0.9-(30000)=0
Wy multiply elements
0.9x-30000=0
We move all terms containing x to the left, all other terms to the right
0.9x=30000
x=30000/0.9
x=33333+0.29999999999927/0.9
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