X+2y+1=9

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Solution for X+2y+1=9 equation: 



X+2X+1=9

We move all terms to the left:

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

We add all the numbers together, and all the variables

3X-8=0

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

3X=8

X=8/3

X=2+2/3

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