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x+2x+3x+4x+5x+6x+7x+8x+9x=30000
We move all terms to the left:
x+2x+3x+4x+5x+6x+7x+8x+9x-(30000)=0
We add all the numbers together, and all the variables
45x-30000=0
We move all terms containing x to the left, all other terms to the right
45x=30000
x=30000/45
x=666+2/3
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