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X(X)=15-2X
We move all terms to the left:
X(X)-(15-2X)=0
We add all the numbers together, and all the variables
XX-(-2X+15)=0
We get rid of parentheses
XX+2X-15=0
We add all the numbers together, and all the variables
2X+XX-15=0
We move all terms containing X to the left, all other terms to the right
2X+XX=15
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