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(100-x)*(100-2x)=0.72
We move all terms to the left:
(100-x)*(100-2x)-(0.72)=0
We add all the numbers together, and all the variables
(-1x+100)*(-2x+100)-(0.72)=0
We add all the numbers together, and all the variables
(-1x+100)*(-2x+100)-0.72=0
We move all terms containing x to the left, all other terms to the right
(-1x+100)*(-2x+100)=0.72
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