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(0.5X)X(X+1)=351
We move all terms to the left:
(0.5X)X(X+1)-(351)=0
We add all the numbers together, and all the variables
(+0.5X)X(X+1)-351=0
We move all terms containing X to the left, all other terms to the right
(+0.5X)X(X+1)=351
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