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x+x+2x+3x+4x+5x=100
We move all terms to the left:
x+x+2x+3x+4x+5x-(100)=0
We add all the numbers together, and all the variables
16x-100=0
We move all terms containing x to the left, all other terms to the right
16x=100
x=100/16
x=6+1/4
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