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100(1+x)+100(1+x)(1+x)+100(1+x)(1+x)(1+x)=0
We add all the numbers together, and all the variables
100(x+1)+100(x+1)(x+1)+100(x+1)(x+1)(x+1)=0
We multiply parentheses
100x+100(x+1)(x+1)+100(x+1)(x+1)(x+1)+100=0
We multiply parentheses ..
100(+x^2+x+x+1)+100(+x^2+x+x+1)(x+1)+100x+100=0
We multiply parentheses
100x^2+100(+x^2+x+x+1)(x+1)+100x+100x+100x+100+100=0
We add all the numbers together, and all the variables
100x^2+100(+x^2+x+x+1)(x+1)+300x+200=0
We move all terms containing x to the left, all other terms to the right
100x^2+100(+x^2+x+x+1)(x+1)+300x=-200
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