x+3x+x+9=89

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Solution for x+3x+x+9=89 equation: 



x+3x+x+9=89

We move all terms to the left:

x+3x+x+9-(89)=0

We add all the numbers together, and all the variables

5x-80=0

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

5x=80

x=80/5

x=16

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