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X+(X-3)+2(X-3)=107

We move all terms to the left:

X+(X-3)+2(X-3)-(107)=0

We multiply parentheses

X+(X-3)+2X-6-107=0

We get rid of parentheses

X+X+2X-3-6-107=0

We add all the numbers together, and all the variables

4X-116=0

We move all terms containing X to the left, all other terms to the right

4X=116

X=116/4

X=29

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