x+(x-1)+3x+9x=279

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Solution for x+(x-1)+3x+9x=279 equation: 



x+(x-1)+3x+9x=279

We move all terms to the left:

x+(x-1)+3x+9x-(279)=0

We add all the numbers together, and all the variables

13x+(x-1)-279=0

We get rid of parentheses

13x+x-1-279=0

We add all the numbers together, and all the variables

14x-280=0

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

14x=280

x=280/14

x=20

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