X+y+(y-1)=9

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Solution for X+y+(y-1)=9 equation: 



X+X+(X-1)=9

We move all terms to the left:

X+X+(X-1)-(9)=0

We add all the numbers together, and all the variables

2X+(X-1)-9=0

We get rid of parentheses

2X+X-1-9=0

We add all the numbers together, and all the variables

3X-10=0

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

3X=10

X=10/3

X=3+1/3

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