X+3x=20+9

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Solution for X+3x=20+9 equation: 



X+3X=20+9

We move all terms to the left:

X+3X-(20+9)=0

We add all the numbers together, and all the variables

X+3X-29=0

We add all the numbers together, and all the variables

4X-29=0

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

4X=29

X=29/4

X=7+1/4

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