X+3x-5=21-9x

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Solution for X+3x-5=21-9x equation: 



X+3X-5=21-9X

We move all terms to the left:

X+3X-5-(21-9X)=0

We add all the numbers together, and all the variables

X+3X-(-9X+21)-5=0

We add all the numbers together, and all the variables

4X-(-9X+21)-5=0

We get rid of parentheses

4X+9X-21-5=0

We add all the numbers together, and all the variables

13X-26=0

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

13X=26

X=26/13

X=2

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