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x*2.57=21000
We move all terms to the left:
x*2.57-(21000)=0
Wy multiply elements
2.57x-21000=0
We move all terms containing x to the left, all other terms to the right
2.57x=21000
x=21000/2.57
x=8171+0.53000000000247/2.57
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