2x+x+9=280

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Solution for 2x+x+9=280 equation: 



2x+x+9=280

We move all terms to the left:

2x+x+9-(280)=0

We add all the numbers together, and all the variables

3x-271=0

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

3x=271

x=271/3

x=90+1/3

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