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1x+2x+3x+6x+7x+8x+9x+9x=100
We move all terms to the left:
1x+2x+3x+6x+7x+8x+9x+9x-(100)=0
We add all the numbers together, and all the variables
45x-100=0
We move all terms containing x to the left, all other terms to the right
45x=100
x=100/45
x=2+2/9
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